Unitarianism

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Unitarianism (from Latin unitas "unity, oneness", from unus "one") is a Christian theological movement named for its belief that the God in Christianity is one person, as opposed to the Trinity (tri- from Latin tres "three") which in many other branches of Christianity defines God as three persons in one being: the Father, Son, and Holy Spirit. Unitarian Christians, therefore, believe that Jesus was inspired by God in his moral teachings, and he is a savior, but he was not a deity or God incarnate. Unitarianism does not constitute one single Christian denomination, but rather refers to a collection of both extant and extinct Christian groups, whether historically related to each other or not, which share a common theological concept of the oneness nature of God.

While the uncompromising theological monotheism at the heart of Christian Unitarianism distinguishes it from the major Christian denominations which subscribe to Trinitarian theology, Christian Unitarianism is analogous to the more austere monotheistic understandings of God in Judaism, and nearer to the concept of the oneness of God in Islam.

Unitarianism is also known for the rejection of several other Western Christian doctrines, including the doctrines of original sin, predestination, and the infallibility of the Bible. Unitarians in previous centuries accepted the doctrine of punishment in an eternal hell, but few do today.

Unitarianism might be considered a part of Protestantism, depending on one's stance or viewpoint, and some exclude it from that term due to its Nontrinitarian nature. Despite common origins during the Protestant Reformation, some scholars call it a part of Nontrinitarianism, while others consider it both Protestant and Nontrinitarian, seeing no contradiction between those two terms. None of the three views are universally accepted.

The Unitarian movement is tied to the more radical critiques of the Reformation. First organized in Eastern Europe during the Reformation, Unitarian communities have developed in Britain, South Africa, India, Canada, the United States, Jamaica, Nigeria, and Japan.

Unitarians began almost simultaneously in the Polish–Lithuanian Commonwealth and in Transylvania in the mid-16th century. Among the adherents were a significant number of Italians who took refuge in Poland. In the 17th century, significant repression in Poland led many Unitarians to flee or be killed for their faith, notably Katarzyna Weiglowa. From the 16th to 18th centuries, Unitarians in Britain often faced significant political persecution, including John Biddle, Mary Wollstonecraft, and Theophilus Lindsey. In England, the first Unitarian Church was established in 1774 on Essex Street, London, where today's British Unitarian headquarters are still located.

In the United States, different schools of Unitarian theology first spread in New England and the mid-Atlantic states. The first official acceptance of the Unitarian faith on the part of a congregation in America was by King's Chapel in Boston, from where James Freeman began teaching Unitarian doctrine in 1784, and was appointed rector and revised the prayer book according to Unitarian doctrines in 1786.

In India, three different schools of Unitarian thought influenced varying movements, including the Brahmo Samaj, the Unitarian Church of the Khasi Hills, and the Unitarian Christian Church of Chennai, in Madras, founded in 1795.

Unitarians place emphasis on the ultimate role of reason in interpreting sacred scriptures, and thus freedom of conscience and freedom of the pulpit are core values in the tradition. Reformation is an ongoing process, to be celebrated. Constant study and new experiences can lead to new insights for teachings and community practice. In varying contexts, Unitarians seek to affirm the use of reason in religion and freedom of conscience.

In J. Gordon Melton's Encyclopedia of American Religions, the Unitarian tradition is classified among "the 'liberal' family of churches".

Terminology

A sign of the Unitarian Universalist Association in Rochester, Minnesota. Unitarianism in the English-speaking world largely evolved into a pluralistic liberal religious movement, while retaining its distinctiveness in continental Europe and elsewhere.

 

Unitarianism is a proper noun and follows the same English usage as other theologies that have developed within a religious movement (Calvinism, Anabaptism, Adventism, Wesleyanism, Lutheranism, etc.). The term existed shortly before it became the name of a religious movement, thus occasionally it is used as a common noun that would describe any understanding of Jesus Christ that denies the Trinity or which believes that God is only one person. In that case, it would be a nontrinitarian belief system not necessarily associated with the Unitarian religious movement. For example, the Unitarian movement has never accepted the Godhood of Jesus, and therefore does not include those nontrinitarian belief systems that do, such as Oneness Pentecostalism, United Pentecostal Church International and the True Jesus Church and the writings of Michael Servetus, all of which maintain that Jesus is God as a single person. Although these groups are unitarians in the common sense, they are not in the proper sense. To avoid confusion, this article is about Unitarianism as a religious movement (proper noun). For the generic form of unitarianism (the Christology), see Nontrinitarianism. Recently some religious groups have adopted the 19th-century term biblical unitarianism to distinguish their theology from Unitarianism. These likewise have no direct relation to the Unitarian movement. 

The term Unitarian is sometimes applied today to those who belong to a Unitarian church but do not hold a Unitarian theological belief. In the past, the vast majority of members of Unitarian churches were Unitarians also in theology. Over time, however, some Unitarians and Unitarian Universalists moved away from the traditional Christian roots of Unitarianism. For example, in the 1890s the American Unitarian Association began to allow non-Christian and non-theistic churches and individuals to be part of their fellowship. As a result, people who held no Unitarian belief began to be called Unitarians because they were members of churches that belonged to the American Unitarian Association. After several decades, the non-theistic members outnumbered the theological Unitarians. A similar, though proportionally much smaller, phenomenon has taken place in the Unitarian churches in the United Kingdom, Canada, and other countries, which remain more theistically based. Unitarian theology, therefore, is distinguishable from the belief system of modern Unitarian and Unitarian Universalist churches and fellowships. This article includes information about Unitarianism as a theology and about the development of theologically Unitarian churches. For a more specific discussion of Unitarianism as it evolved into a pluralistic liberal religious movement, see Unitarian Universalism (and its national groups the Unitarian Universalist Association in the United States, the Canadian Unitarian Council in Canada, the General Assembly of Unitarian and Free Christian Churches in the United Kingdom, and the International Council of Unitarians and Universalists).

History

Ferenc Dávid holding his speech at the Diet of Torda, The Kingdom of Hungary in 1568 (today Turda, Romania) by Aladár Körösfői-Kriesch (1896)

 

Unitarianism, both as a theology and as a denominational family of churches, was defined and developed in Poland, Transylvania, England, Wales and the United States. Although common beliefs existed among Unitarians in each of these regions, they initially grew independently from each other. Only later did they influence one another and accumulate more similarities.

The Ecclesia minor or Minor Reformed Church of Poland, better known today as the Polish Brethren, was born as the result of a controversy that started on January 22, 1556, when Piotr of Goniądz (Peter Gonesius), a Polish student, spoke out against the doctrine of the Trinity during the general synod of the Reformed (Calvinist) churches of Poland held in the village of Secemin. After nine years of debate, in 1565, the anti-Trinitarians were excluded from the existing synod of the Polish Reformed Church (henceforth the Ecclesia maior) and they began to hold their own synods as the Ecclesia minor. Though frequently called "Arians" by those on the outside, the views of Fausto Sozzini (Faustus Socinus) became the standard in the church, and these doctrines were quite removed from Arianism. So important was Socinus to the formulation of their beliefs that those outside Poland usually referred to them as Socinians. The Polish Brethren were disbanded in 1658 by the Sejm (Polish Parliament). They were ordered to convert to Roman Catholicism or leave Poland. Most of them went to Transylvania or Holland, where they embraced the name "Unitarian." Between 1665 and 1668 a grandson of Socinus, Andrzej Wiszowaty Sr., published Bibliotheca Fratrum Polonorum quos Unitarios vocant (Library of the Polish Brethren who are called Unitarians 4 vols. 1665–69).

The Unitarian Church in Transylvania was first recognized by the Edict of Torda, issued by the Transylvanian Diet under Prince John II Sigismund Zápolya (January 1568), and was first led by Ferenc Dávid (a former Calvinist bishop, who had begun preaching the new doctrine in 1566). The term "Unitarian" first appeared as unitaria religio in a document of the Diet of Lécfalva, Transylvania, on 25 October 1600, though it was not widely used in Transylvania until 1638, when the formal recepta Unitaria Religio was published.

The word Unitarian had been circulating in private letters in England, in reference to imported copies of such publications as the Library of the Polish Brethren who are called Unitarians (1665). Henry Hedworth was the first to use the word "Unitarian" in print in English (1673), and the word first appears in a title in Stephen Nye's A brief history of the Unitarians, called also Socinians (1687). The movement gained popularity in England in the wake of the Enlightenment and began to become a formal denomination in 1774 when Theophilus Lindsey organised meetings with Joseph Priestley, founding the first avowedly Unitarian congregation in the country. This occurred at Essex Street Church in London.

The first official acceptance of the Unitarian faith on the part of a congregation in America was by King's Chapel in Boston, which settled James Freeman (1759–1835) in 1782, and revised the Prayer Book into a mild Unitarian liturgy in 1785. In 1800, Joseph Stevens Buckminster became minister of the Brattle Street Church in Boston, where his brilliant sermons, literary activities, and academic attention to the German "New Criticism" helped shape the subsequent growth of Unitarianism in New England. Unitarian Henry Ware (1764–1845) was appointed as the Hollis professor of divinity at Harvard College, in 1805. Harvard Divinity School then shifted from its conservative roots to teach Unitarian theology (see Harvard and Unitarianism). Buckminster's close associate William Ellery Channing (1780–1842) was settled over the Federal Street Church in Boston, 1803, and in a few years he became the leader of the Unitarian movement. A theological battle with the Congregational Churches resulted in the formation of the American Unitarian Association at Boston in 1825.

Beliefs

Christology

Unitarians believe that mainline Christianity does not adhere to strict monotheism, but that Unitarians do by maintaining that Jesus was a great man and a prophet of God, perhaps even a supernatural being, but not God himself. They believe Jesus did not claim to be God and that his teachings did not suggest the existence of a triune God. Unitarians believe in the moral authority but not necessarily the divinity of Jesus. Their theology is thus opposed to the trinitarian theology of other Christian denominations.

Unitarian Christology can be divided according to whether or not Jesus is believed to have had a pre-human existence. Both forms maintain that God is one being and one "person" and that Jesus is the (or a) Son of God, but generally not God himself.

In the early 19th century, Unitarian Robert Wallace identified three particular classes of Unitarian doctrines in history:

• Arian, which believed in a pre-existence of the Logos, but maintained that Jesus was created and lived as human only;
• Socinian, which denied his original divinity, but agreed that Christ should be worshipped; and
• "Strict Unitarian", which, believing in an "incommunicable divinity of God", denied both the existence of the Holy Spirit and the worship of "the man Christ."

Unitarianism is considered a factor in the decline of classical deism because there were people who increasingly preferred to identify themselves as Unitarians rather than deists.

• Conservative Unitarian theology accommodates a wide range of understandings of God.
• Radical Unitarian theology further rejects the importance of dogma, liturgy, and anything other than ethics and a gospel of love.

Several tenets of Unitarianism overlap with the predominant Muslim view of Jesus and Islamic understanding of monotheism, although no direct link between the two is suggested.

"Socinian" Christology

Fausto Sozzini was an Italian theologian who helped define Unitarianism and also served the Polish Brethren church

 

The Christology commonly called "Socinian" (after Fausto Sozzini, one of the founders of Unitarian theology) refers to the belief that Jesus Christ began his life when he was born as a human. In other words, the teaching that Jesus pre-existed his human body is rejected. There are various views ranging from the belief that Jesus was simply a human (psilanthropism) who, because of his greatness, was adopted by God as his Son (adoptionism) to the belief that Jesus literally became the son of God when he was conceived by the Holy Spirit.

This Christology existed in some form or another prior to Sozzini. Theodotus of Byzantium, Artemon and Paul of Samosata denied the pre-existence of Christ. These ideas were continued by Marcellus of Ancyra and his pupil Photinus in the 4th century AD. In the Radical Reformation and Anabaptist movements of the 16th century this idea resurfaced with Sozzini's uncle, Lelio Sozzini. Having influenced the Polish Brethren to a formal declaration of this belief in the Racovian Catechism, Fausto Sozzini involuntarily ended up giving his name to this Christological position, which continued with English Unitarians such as John Biddle, Thomas Belsham, Theophilus Lindsey, Joseph Priestley, and James Martineau. In America, most of the early Unitarians were "Arian" in Christology (see below), but among those who held to a "Socinian" view was James Freeman.

Regarding the virgin birth of Jesus among those who denied the preexistence of Christ, some held to it and others did not. Its denial is sometimes ascribed to the Ebionites; however, Origen (Contra Celsum v.61) and Eusebius (HE iii.27) both indicate that some Ebionites did accept the virgin birth. On the other hand, Theodotus of Byzantium, Artemon, and Paul of Samosata all accepted the virgin birth. In the early days of Unitarianism, the stories of the virgin birth were accepted by most. There were a number of Unitarians who questioned the historical accuracy of the Bible, including Symon Budny, Jacob Palaeologus, Thomas Belsham, and Richard Wright, and this made them question the virgin birth story. Beginning in England and America in the 1830s, and manifesting itself primarily in Transcendentalist Unitarianism, which emerged from the German liberal theology associated primarily with Friedrich Schleiermacher, the psilanthropist view increased in popularity. Its proponents took an intellectual and humanistic approach to religion. They embraced evolutionary concepts, asserted the "inherent goodness of man", and abandoned the doctrine of biblical infallibility, rejecting most of the miraculous events in the Bible (including the virgin birth). Notable examples are James Martineau, Theodore Parker, Ralph Waldo Emerson and Frederic Henry Hedge. Famous American Unitarian William Ellery Channing was a believer in the virgin birth until later in his life, after he had begun his association with the Transcendentalists.

"Arian" Christology

Constantine I burning Arian books, illustration from a book of canon law, c. 825

 

The Christology commonly called "Arian" holds that Jesus, before his human life, existed as the Logos, a being created by God, who dwelt with God in heaven. There are many varieties of this form of Unitarianism, ranging from the belief that the Son was a divine spirit of the same nature as God before coming to earth, to the belief that he was an angel or other lesser spirit creature of a wholly different nature from God. Not all of these views necessarily were held by Arius, the namesake of this Christology. It is still Nontrinitarian because, according to this belief system, Jesus has always been beneath God, though higher than humans. Arian Christology was not a majority view among Unitarians in Poland, Transylvania or England. It was only with the advent of American Unitarianism that it gained a foothold in the Unitarian movement.

Among early Christian theologians who believed in a pre-existent Jesus who was subordinate to God the Father were Lucian of Antioch, Eusebius of Caesarea, Arius, Eusebius of Nicomedia, Asterius the Sophist, Eunomius, and Ulfilas, as well as Felix, Bishop of Urgell. Proponents of this Christology also associate it (more controversially) with Justin Martyr and Hippolytus of Rome. Antitrinitarian Michael Servetus did not deny the pre-existence of Christ, so he may have believed in it. (In his "Treatise Concerning the Divine Trinity" Servetus taught that the Logos (Word) was the reflection of Christ, and "that reflection of Christ was 'the Word with God" that consisted of God Himself, shining brightly in heaven, "and it was God Himself" and that "the Word was the very essence of God or the manifestation of God's essence, and there was in God no other substance or hypostasis than His Word, in a bright cloud where God then seemed to subsist. And in that very spot the face and personality of Christ shone bright.") Isaac Newton had Arian beliefs as well. Famous 19th-century Arian Unitarians include Andrews Norton and Dr. William Ellery Channing (in his earlier years).

Other beliefs

Although there is no specific authority on convictions of Unitarian belief aside from rejection of the Trinity, the following beliefs are generally accepted:

• One God and the oneness or unity of God.
• The life and teachings of Jesus Christ constitute the exemplar model for living one's own life.
• Reason, rational thought, science, and philosophy coexist with faith in God.
• Humans have the ability to exercise free will in a responsible, constructive and ethical manner with the assistance of religion.
• Human nature in its present condition is neither inherently corrupt nor depraved (see original Sin) but capable of both good and evil, as God intended.
• No religion can claim an absolute monopoly on the Holy Spirit or theological truth.
• Though the authors of the Bible were inspired by God, they were humans and therefore subject to human error.
• The traditional doctrines of predestination, eternal damnation, and the vicarious sacrifice and satisfaction theories of the Atonement are invalid because they malign God's character and veil the true nature and mission of Jesus Christ.

Unitarians have liberal views of God, Jesus, the world and purpose of life as revealed through reason, scholarship, science, philosophy, scripture and other prophets and religions. They believe that reason and belief are complementary and that religion and science can co-exist and guide them in their understanding of nature and God. They also do not enforce belief in creeds or dogmatic formulas. Although there is flexibility in the nuances of belief or basic truths for the individual Unitarian Christian, general principles of faith have been recognized as a way to bind the group in some commonality.

Unitarian Christians reject the doctrine of some Christian denominations that God chooses to redeem or save only those certain individuals that accept the creeds of, or affiliate with, a specific church or religion, from a common ruin or corruption of the mass of humanity.

In 1938, The Christian leader attributed "the religion of Jesus, not a religion about Jesus" to Unitarians, though the phrase was used earlier by Congregationalist Rollin Lynde Hartt in 1924 and earlier still by US President Thomas Jefferson.

Worship

Worship within the Unitarian tradition accommodates a wide range of understandings of God, while the focus of the service may be simply the celebration of life itself. Each Unitarian congregation is at liberty to devise its own form of worship, though commonly, Unitarians will light their chalice (symbol of faith), have a story for all ages; and include sermons, prayers, hymns and songs. Some will allow attendees to publicly share their recent joys or concerns.

Modern Christian Unitarian organizations

First Unitarian Meeting House in Madison, Wisconsin, designed by Unitarian Frank Lloyd Wright

 

This section relates to Unitarian churches and organizations today which are still specifically Christian, whether within or outside Unitarian Universalism. Unitarian Universalism, conversely, refers to the embracing of non-Christian religions.

International groups

Some Unitarian Christian groups are affiliated with the International Council of Unitarians and Universalists (ICUU), founded in 1995. The ICUU tends to contain a majority membership who express specifically Unitarian Christian beliefs, rather than the religious pluralism of the UUA, but nevertheless remain liberal, open-minded and inclusive communities. The ICUU has "full member" groups in the United States, Australia, New Zealand, United Kingdom, Canada, Brazil, Czech Republic, Finland, Germany, Hungary, Indonesia, India, Nigeria, Pakistan, Philippines, Romania, South Africa, and Sri Lanka.

The ICUU includes small "Associate groups", including Congregazione Italiana Cristiano Unitariana, Turin (founded in 2004) and the Bét Dávid Unitarian Association, Oslo (founded 2005).

Transylvania, Hungary and Romania

The Dârjiu fortified church, a 13th-century fortified church belonging to the Unitarian Church of Transylvania. This is the only Unitarian fortified church in Transylvania which is on the UNESCO's World Heritage List.

 

The largest Unitarian denomination worldwide today is also the oldest surviving Unitarian denomination (since 1565, first use of the term "Unitarian" 1600); the Unitarian Church of Transylvania (in Romania, which is in union with the Unitarian Church in Hungary). The church in Romania and Hungary still looks to the statement of faith, the Summa Universae Theologiae Christianae secundum Unitarios (1787), though today assent to this is not required. The modern Unitarian Church in Hungary (25,000 members) and the Transylvanian Unitarian Church (75,000 members) are affiliated with the International Council of Unitarians and Universalists (ICUU) and claim continuity with the historical Unitarian Christian tradition established by Ferenc Dávid in 1565 in Transylvania under John II Sigismund Zápolya. The Unitarian churches in Hungary and Transylvania are structured and organized along a church hierarchy that includes the election by the synod of a national bishop who serves as superintendent of the Church. Many Hungarian Unitarians embrace the principles of rationalist Unitarianism. Unitarian high schools exist only in Transylvania (Romania), including the John Sigismund Unitarian Academy in Cluj-Napoca (Kolozsvár), the Protestant Theological Institute of Cluj, and the Berde Mózes Unitárius Gimnázium in Cristuru Secuiesc (Székelykeresztúr); both teach Rationalist Unitarianism.

United Kingdom

Newington Green Unitarian Church in London, England. Built in 1708, this is the oldest nonconformist church in London still in use.

 

The Unitarian Christian Association (UCA) was founded in the United Kingdom in 1991 by Rev. Lancelot Garrard (1904–93) and others to promote specifically Christian ideas within the General Assembly of Unitarian and Free Christian Churches (GAUFCC), the national Unitarian body in Great Britain. Just as the UUCF and ICUU maintain formal links with the Unitarian Universalist Association in the USA, so the UCA is an affiliate body of the GAUFCC in Great Britain.

The majority of Unitarian Christian publications are sponsored by an organization and published specifically for their membership. Generally, they do not serve as a tool for missionary work or encouraging conversions.

The leadership of the Church is made up of Accredited Lay Preachers and Professional Ministers.

United States

A Unitarian Assembly in Louisville, Kentucky.

 

The Unitarian Christian Conference USA is a network of congregations and ministers in the United States identifying with the historic Unitarian Christian tradition. The Unitarian Christian Conference USA promotes the concept of the unity of God and the message and example of Jesus of Nazareth as a rational and enriching spiritual path for personal development and a guide for creating a world of justice, peace and human dignity.

The Unitarian Universalist Christian Fellowship (UUCF) was founded in 1945 and as such predates the consolidation of the American Unitarian Association (AUA) and Universalist Church of America (UCA) into the Unitarian Universalist Association (UUA) in 1961. UUCF continues as a subgroup of UUA serving the Christian members.

The American Unitarian Conference (AUC) was formed in 2000 and stands between UUA and ICUU in attachment to the Christian element of modern Unitarianism. The American Unitarian Conference is open to non-Christian Unitarians, being particularly popular with non-Christian theists and deists. The AUC has four congregations in the United States.

Unitarian Christian Ministries International was a Unitarian ministry incorporated in South Carolina until its dissolution in 2013 when it merged with the Unitarian Christian Emerging Church. The Unitarian Christian Emerging Church has recently undergone reorganization and today is known as the Unitarian Christian Church of America.

Australia and New Zealand

The Sydney Unitarian Church was founded 1850 under a Reverend Mr Stanley and was a vigorous denomination during the 19th century. The modern church, no longer unitarian Christian, has properties in Adelaide, Sydney and Melbourne, and smaller congregations elsewhere in Australia and New Zealand.

South Africa

The Unitarian movement in South Africa was founded in 1867 by David Faure, member of a well-known Cape family. He encountered advanced liberal religious thought while completing his studies at the University of Leiden in Holland for the ministry of the Dutch Reformed Church in Cape Town.

Biblical Unitarian Movement

Biblical Unitarianism (or "Biblical Unitarianism" or "biblical unitarianism") identifies the Christian belief that the Bible teaches God is a singular person, the Father, and that Jesus is a distinct being, his son. A few denominations use this term to describe themselves, clarifying the distinction between them and those churches which, from the late 19th century, evolved into modern British Unitarianism and, primarily in the United States, Unitarian Universalism. In Italy the Biblical Unitarian Movement powered by the ideas of Sozzini and others is represented today by the churches associated with the Christian Church in Italy.

Notable Unitarians

Sir Isaac Newton held Arian views

 

Notable Unitarians include classical composers Edvard Grieg and Béla Bartók, Ralph Waldo Emerson, Theodore Parker and Thomas Lamb Eliot in theology and ministry, Oliver Heaviside, Erasmus Darwin, Joseph Priestley, John Archibald Wheeler, Linus Pauling, Sir Isaac Newton and inventor Sir Francis Ronalds in science, George Boole in mathematics, Susan B. Anthony in civil government, Florence Nightingale in humanitarianism and social justice, John Bowring, Samuel Taylor Coleridge and Elizabeth Gaskell in literature, Frank Lloyd Wright in the arts, Josiah Wedgwood and Samuel Carter MP in industry, Thomas Starr King in ministry and politics, and Charles William Eliot in education. Julia Ward Howe was a leader in the woman suffrage movement, the first ever woman to be elected to the Academy of Arts and Letters, and author of the Battle Hymn of the Republic along with volumes of poetry and other writing. Although raised a Quaker, Ezra Cornell, founder of Cornell University in Ithaca, New York, attended the Unitarian church and was one of the founders of Ithaca's First Unitarian Church. Eramus Darwin Shattuck, a signatory to the Oregon State Constitution, founded the first Unitarian Church in Oregon in 1865.

Eleven Nobel prizes have been awarded to Unitarians: Robert Millikan and John Bardeen (twice) in Physics; Emily Green Balch, Albert Schweitzer, and Linus Pauling for Peace; George Wald and David H. Hubel in Medicine; Linus Pauling in Chemistry; and Herbert A. Simon in Economics.

Four presidents of the United States were Unitarians: John Adams, John Quincy Adams, Millard Fillmore, and William Howard Taft. Adlai Stevenson II, the Democratic presidential nominee in 1952 and 1956, was a Unitarian, and he was the last Unitarian to be nominated by a major party for president. Although a self-styled materialist, Thomas Jefferson was pro-Unitarian to the extent of advocating that it become the predominant religion in the United States.

British prime minister Neville Chamberlain was raised by his Unitarian statesman father, Joseph Chamberlain. Certainly, in the United Kingdom, Unitarianism – the religion of only a small minority of the country's population – had an enormous impact on Victorian politics, not only in the larger cities – Birmingham, Leeds, Manchester, and Liverpool – but in smaller communities like Leicester where there were so many Unitarian mayors that the Unitarian Chapel was known as the "Mayors' Nest".

In Birmingham a Unitarian church was opened in 1862. The Church of the Messiah, as it was called, was more than the centre of a small sect: it was a cultural and intellectual centre of a whole society, a place where ideas about society were openly and critically discussed. Henry W. Crosskey’s Birmingham Unitarian congregation included: Joseph Chamberlain, as well as Arthur, his younger brother, who was married to Louisa Kenrick; William Kenrick, his brother-in-law, who was married to Mary Chamberlain; and Sir Thomas Martineau, who was the nephew of Harriet Martineau, another outspoken public figure and author of the time. Sir Thomas Martineau (died 1893), was related to the Chamberlain family by marriage; Sir Thomas had married Emily Kenrick, the sister of Florence Chamberlain, née Kenrick.

In Lambeth, South London, another two members of the Martineau family, Caroline and Constance, worked at Morley College, the former acting as (unpaid) principal for over 11 years. Several other prominent Unitarians were involved in the development of this liberal arts college, which was founded by actors at the Old Vic theatre.

These elite British Unitarian families: the Nettlefolds, the Martineaus, the Luptons, the Kitsons and the Kenricks, found a most significant place in the social and political history of Victorian through to mid-20th-century Britain.

Other Unitarians include Sir Tim Berners-Lee, inventor of the World Wide Web, Lancelot Ware, founder of Mensa, Sir Adrian Boult, the conductor, Ray Kurzweil, notable inventor and futurist, and C. Killick Millard, founder of the Dignity in Dying society to support voluntary euthanasia. Ram Mohan Roy, an Indian reformer of the 18th century, was a Unitarian who published a book called Precepts of Jesus.

Joseph Priestley

From Wikipedia, the free encyclopedia

Priestley by Ellen Sharples (1794)

 

During his lifetime, Priestley's considerable scientific reputation rested on his invention of soda water, his writings on electricity, and his discovery of several "airs" (gases), the most famous being what Priestley dubbed "dephlogisticated air" (oxygen). However, Priestley's determination to defend phlogiston theory and to reject what would become the chemical revolution eventually left him isolated within the scientific community. 

Priestley's science was integral to his theology, and he consistently tried to fuse Enlightenment rationalism with Christian theism. In his metaphysical texts, Priestley attempted to combine theism, materialism, and determinism, a project that has been called "audacious and original". He believed that a proper understanding of the natural world would promote human progress and eventually bring about the Christian millennium. Priestley, who strongly believed in the free and open exchange of ideas, advocated toleration and equal rights for religious Dissenters, which also led him to help found Unitarianism in England. The controversial nature of Priestley's publications, combined with his outspoken support of the French Revolution, aroused public and governmental suspicion; he was eventually forced to flee in 1791, first to London and then to the United States, after a mob burned down his Birmingham home and church. He spent his last ten years in Northumberland County, Pennsylvania. 

A scholar and teacher throughout his life, Priestley also made significant contributions to pedagogy, including the publication of a seminal work on English grammar and books on history, and he prepared some of the most influential early timelines. These educational writings were among Priestley's most popular works. It was his metaphysical works, however, that had the most lasting influence, being considered primary sources for utilitarianism by philosophers such as Jeremy Bentham, John Stuart Mill, and Herbert Spencer.

Early life and education (1733–55)

Priestley's birthplace (since demolished) in Fieldhead, Birstall, West Yorkshire – about six miles (10 km) southwest of Leeds

 

Priestley was born to an established English Dissenting family (i.e. they did not conform to the Church of England) in Birstall, near Batley in the West Riding of Yorkshire. He was the oldest of six children born to Mary Swift and Jonas Priestley, a finisher of cloth. To ease his mother's burdens, Priestley was sent to live with his grandfather around the age of one. He returned home, five years later, after his mother died. When his father remarried in 1741, Priestley went to live with his aunt and uncle, the wealthy and childless Sarah and John Keighley, 3 miles (4.8 km) from Fieldhead. Because Priestley was precocious—at the age of four he could flawlessly recite all 107 questions and answers of the Westminster Shorter Catechism—his aunt sought the best education for the boy, intending him for the ministry. During his youth, Priestley attended local schools where he learned Greek, Latin, and Hebrew.

Around 1749, Priestley became seriously ill and believed he was dying. Raised as a devout Calvinist, he believed a conversion experience was necessary for salvation, but doubted he had had one. This emotional distress eventually led him to question his theological upbringing, causing him to reject election and to accept universal salvation. As a result, the elders of his home church, the Independent Upper Chapel of Heckmondwike, refused him admission as a full member.

Priestley's illness left him with a permanent stutter and he gave up any thoughts of entering the ministry at that time. In preparation for joining a relative in trade in Lisbon, he studied French, Italian, and German in addition to Aramaic, and Arabic. He was tutored by the Reverend George Haggerstone, who first introduced him to higher mathematics, natural philosophy, logic, and metaphysics through the works of Isaac Watts, Willem 's Gravesande, and John Locke.

Daventry Academy

Priestley eventually decided to return to his theological studies and, in 1752, matriculated at Daventry, a Dissenting academy. Because he had already read widely, Priestley was allowed to skip the first two years of coursework. He continued his intense study; this, together with the liberal atmosphere of the school, shifted his theology further leftward and he became a Rational Dissenter. Abhorring dogma and religious mysticism, Rational Dissenters emphasised the rational analysis of the natural world and the Bible.

Priestley later wrote that the book that influenced him the most, save the Bible, was David Hartley's Observations on Man (1749). Hartley's psychological, philosophical, and theological treatise postulated a material theory of mind. Hartley aimed to construct a Christian philosophy in which both religious and moral "facts" could be scientifically proven, a goal that would occupy Priestley for his entire life. In his third year at Daventry, Priestley committed himself to the ministry, which he described as "the noblest of all professions".

Needham Market and Nantwich (1755–61)

Title page of Rudiments of English Grammar (1761)

Robert Schofield, Priestley's major modern biographer, describes his first "call" in 1755 to the Dissenting parish in Needham Market, Suffolk, as a "mistake" for both Priestley and the congregation. Priestley yearned for urban life and theological debate, whereas Needham Market was a small, rural town with a congregation wedded to tradition. Attendance and donations dropped sharply when they discovered the extent of his heterodoxy. Although Priestley's aunt had promised her support if he became a minister, she refused any further assistance when she realised he was no longer a Calvinist. To earn extra money, Priestley proposed opening a school, but local families informed him that they would refuse to send their children. He also presented a series of scientific lectures titled "Use of the Globes" that was more successful.

Sweetbriar Hall plaque

 

Priestley's Daventry friends helped him obtain another position and in 1758 he moved to Nantwich, Cheshire, living at Sweetbriar Hall in the town's Hospital Street; his time there was happier. The congregation cared less about Priestley's heterodoxy and he successfully established a school. Unlike many schoolmasters of the time, Priestley taught his students natural philosophy and even bought scientific instruments for them. Appalled at the quality of the available English grammar books, Priestley wrote his own: The Rudiments of English Grammar (1761). His innovations in the description of English grammar, particularly his efforts to dissociate it from Latin grammar, led 20th-century scholars to describe him as "one of the great grammarians of his time". After the publication of Rudiments and the success of Priestley's school, Warrington Academy offered him a teaching position in 1761.

Warrington Academy (1761–1767)

Jasperware cameo of Priestley, Josiah Wedgwood & Sons

 

Mary Priestley, by Carl F. von Breda (1793); daughter of ironmaster Isaac Wilkinson, sister of industrialist John Wilkinson

 

In 1761, Priestley moved to Warrington and assumed the post of tutor of modern languages and rhetoric at the town's Dissenting academy, although he would have preferred to teach mathematics and natural philosophy. He fitted in well at Warrington, and made friends quickly. These included John Aikin, his sister Anna Laetitia Aikin, and Josiah Wedgwood. Wedgwood met Priestley in 1762, after a fall from his horse. Wedgwood and Priestley met rarely, but exchanged letters, advice on chemistry, and laboratory equipment. Wedgwood eventually created a medallion of Priestley in cream-on-blue jasperware.

On 23 June 1762, Priestley married Mary Wilkinson of Wrexham. Of his marriage, Priestley wrote:

This proved a very suitable and happy connexion, my wife being a woman of an excellent understanding, much improved by reading, of great fortitude and strength of mind, and of a temper in the highest degree affectionate and generous; feeling strongly for others, and little for herself. Also, greatly excelling in every thing relating to household affairs, she entirely relieved me of all concern of that kind, which allowed me to give all my time to the prosecution of my studies, and the other duties of my station.

On 17 April 1763, they had a daughter, whom they named Sarah after Priestley's aunt.

Educator and historian

All of the books Priestley published while at Warrington emphasised the study of history; Priestley considered it essential for worldly success as well as religious growth. He wrote histories of science and Christianity in an effort to reveal the progress of humanity and, paradoxically, the loss of a pure, "primitive Christianity".

A redacted version of A New Chart of History (1765); Priestley believed this chart would "impress" upon students "a just image of the rise, progress, extent, duration, and contemporary state of all the considerable empires that have ever existed in the world"

 

In his Essay on a Course of Liberal Education for Civil and Active Life (1765), Lectures on History and General Policy (1788), and other works, Priestley argued that the education of the young should anticipate their future practical needs. This principle of utility guided his unconventional curricular choices for Warrington's aspiring middle-class students. He recommended modern languages instead of classical languages and modern rather than ancient history. Priestley's lectures on history were particularly revolutionary; he narrated a providentialist and naturalist account of history, arguing that the study of history furthered the comprehension of God's natural laws. Furthermore, his millennial perspective was closely tied to his optimism regarding scientific progress and the improvement of humanity. He believed that each age would improve upon the previous and that the study of history allowed people to perceive and to advance this progress. Since the study of history was a moral imperative for Priestley, he also promoted the education of middle-class women, which was unusual at the time. Some scholars of education have described Priestley as the most important English writer on education between the 17th-century John Locke and the 19th-century Herbert Spencer. Lectures on History was well received and was employed by many educational institutions, such as New College at Hackney, Brown, Princeton, Yale, and Cambridge. Priestley designed two Charts to serve as visual study aids for his Lectures. These charts are in fact timelines; they have been described as the most influential timelines published in the 18th century. Both were popular for decades, and the trustees of Warrington were so impressed with Priestley's lectures and charts that they arranged for the University of Edinburgh to grant him a Doctor of Law degree in 1764.

History of electricity

Priestley's "electrical machine for amateur experimentalists", illustrated in the first edition of his Familiar Introduction to the Study of Electricity (1768)

 

The intellectually stimulating atmosphere of Warrington, often called the "Athens of the North" (of England) during the 18th century, encouraged Priestley's growing interest in natural philosophy. He gave lectures on anatomy and performed experiments regarding temperature with another tutor at Warrington, his friend John Seddon. Despite Priestley's busy teaching schedule, he decided to write a history of electricity. Friends introduced him to the major experimenters in the field in Britain—John Canton, William Watson, and the visiting Benjamin Franklin—who encouraged Priestley to perform the experiments he wanted to include in his history. In the process of replicating others' experiments, Priestley became intrigued by unanswered questions and was prompted to undertake experiments of his own design. (Impressed with his Charts and the manuscript of his history of electricity, Canton, Franklin, Watson, and Richard Price nominated Priestley for a fellowship in the Royal Society; he was accepted in 1766.)

In 1767, the 700-page The History and Present State of Electricity was published to positive reviews. The first half of the text is a history of the study of electricity to 1766; the second and more influential half is a description of contemporary theories about electricity and suggestions for future research. Priestley reported some of his own discoveries in the second section, such as the conductivity of charcoal and other substances and the continuum between conductors and non-conductors. This discovery overturned what he described as "one of the earliest and universally received maxims of electricity", that only water and metals could conduct electricity. This and other experiments on the electrical properties of materials and on the electrical effects of chemical transformations demonstrated Priestley's early and ongoing interest in the relationship between chemical substances and electricity. Based on experiments with charged spheres, Priestley was among the first to propose that electrical force followed an inverse-square law, similar to Newton's law of universal gravitation. However, he did not generalise or elaborate on this, and the general law was enunciated by French physicist Charles-Augustin de Coulomb in the 1780s. 

Priestley's strength as a natural philosopher was qualitative rather than quantitative and his observation of "a current of real air" between two electrified points would later interest Michael Faraday and James Clerk Maxwell as they investigated electromagnetism. Priestley's text became the standard history of electricity for over a century; Alessandro Volta (who later invented the battery), William Herschel (who discovered infrared radiation), and Henry Cavendish (who discovered hydrogen) all relied upon it. Priestley wrote a popular version of the History of Electricity for the general public titled A Familiar Introduction to the Study of Electricity (1768). He marketed the book with his brother Timothy, but unsuccessfully.

Leeds (1767–73)

The earliest known portrait of Priestley, known as the "Leeds" portrait (c. 1763); except for his membership on the Leeds Library Committee, Priestley was not active in the town's social life

 

Perhaps prompted by Mary Priestley's ill health, or financial problems, or a desire to prove himself to the community that had rejected him in his childhood, Priestley moved with his family from Warrington to Leeds in 1767, and he became Mill Hill Chapel's minister. Two sons were born to the Priestleys in Leeds: Joseph junior on 24 July 1768 and William three years later. Theophilus Lindsey, a rector at Catterick, Yorkshire, became one of Priestley's few friends in Leeds, of whom he wrote: "I never chose to publish any thing of moment relating to theology, without consulting him." Although Priestley had extended family living around Leeds, it does not appear that they communicated. Schofield conjectures that they considered him a heretic. Each year Priestley travelled to London to consult with his close friend and publisher, Joseph Johnson, and to attend meetings of the Royal Society.

Minister of Mill Hill Chapel

Priestley had been working on Institutes of Natural and Revealed Religion since his Daventry days.

 

When Priestley became its minister, Mill Hill Chapel was one of the oldest and most respected Dissenting congregations in England; however, during the early 18th century the congregation had fractured along doctrinal lines, and was losing members to the charismatic Methodist movement. Priestley believed that by educating the young, he could strengthen the bonds of the congregation.

In his magisterial three-volume Institutes of Natural and Revealed Religion (1772–74), Priestley outlined his theories of religious instruction. More importantly, he laid out his belief in Socinianism. The doctrines he explicated would become the standards for Unitarians in Britain. This work marked a change in Priestley's theological thinking that is critical to understanding his later writings—it paved the way for his materialism and necessitarianism (the belief that a divine being acts in accordance with necessary metaphysical laws).

Priestley's major argument in the Institutes was that the only revealed religious truths that could be accepted were those that matched one's experience of the natural world. Because his views of religion were deeply tied to his understanding of nature, the text's theism rested on the argument from design. The Institutes shocked and appalled many readers, primarily because it challenged basic Christian orthodoxies, such as the divinity of Christ and the miracle of the Virgin Birth. Methodists in Leeds penned a hymn asking God to "the Unitarian fiend expel / And chase his doctrine back to Hell." Priestley wanted to return Christianity to its "primitive" or "pure" form by eliminating the "corruptions" which had accumulated over the centuries. The fourth part of the Institutes, An History of the Corruptions of Christianity, became so long that he was forced to issue it separately in 1782. Priestley believed that the Corruptions was "the most valuable" work he ever published. In demanding that his readers apply the logic of the emerging sciences and comparative history to the Bible and Christianity, he alienated religious and scientific readers alike—scientific readers did not appreciate seeing science used in the defence of religion and religious readers dismissed the application of science to religion.

Religious controversialist

Priestley engaged in numerous political and religious pamphlet wars. According to Schofield, "he entered each controversy with a cheerful conviction that he was right, while most of his opponents were convinced, from the outset, that he was willfully and maliciously wrong. He was able, then, to contrast his sweet reasonableness to their personal rancor", but as Schofield points out Priestley rarely altered his opinion as a result of these debates. While at Leeds he wrote controversial pamphlets on the Lord's Supper and on Calvinist doctrine; thousands of copies were published, making them some of Priestley's most widely read works.

Priestley founded the Theological Repository in 1768, a journal committed to the open and rational inquiry of theological questions. Although he promised to print any contribution, only like-minded authors submitted articles. He was therefore obliged to provide much of the journal's content himself (this material became the basis for many of his later theological and metaphysical works). After only a few years, due to a lack of funds, he was forced to cease publishing the journal. He revived it in 1784 with similar results.

Defender of Dissenters and political philosopher

His Essay on the First Principles of Government (1768) influenced early 19th-century political philosophers, including Jeremy Bentham.

 

Many of Priestley's political writings supported the repeal of the Test and Corporation Acts, which restricted the rights of Dissenters. They could not hold political office, serve in the armed forces, or attend Oxford and Cambridge unless they subscribed to the Thirty-nine Articles of the Church of England. Dissenters repeatedly petitioned Parliament to repeal the Acts, arguing that they were being treated as second-class citizens.

Priestley's friends, particularly other Rational Dissenters, urged him to publish a work on the injustices experienced by Dissenters; the result was his Essay on the First Principles of Government (1768). An early work of modern liberal political theory and Priestley's most thorough treatment of the subject, it—unusually for the time—distinguished political rights from civil rights with precision and argued for expansive civil rights. Priestley identified separate private and public spheres, contending that the government should only have control over the public sphere. Education and religion, in particular, he maintained, were matters of private conscience and should not be administered by the state. Priestley's later radicalism emerged from his belief that the British government was infringing upon these individual freedoms.

Priestley also defended the rights of Dissenters against the attacks of William Blackstone, an eminent legal theorist, whose Commentaries on the Laws of England (1765–69) had become the standard legal guide. Blackstone's book stated that dissent from the Church of England was a crime and that Dissenters could not be loyal subjects. Furious, Priestley lashed out with his Remarks on Dr. Blackstone's Commentaries (1769), correcting Blackstone's interpretation of the law, his grammar (a highly politicised subject at the time), and history. Blackstone, chastened, altered subsequent editions of his Commentaries: he rephrased the offending passages and removed the sections claiming that Dissenters could not be loyal subjects, but he retained his description of Dissent as a crime.

Natural philosopher: electricity, Optics, and soda water

Optics: The History and Present State of Vision, Light, and Colours, published in 1772, London

Although Priestley claimed that natural philosophy was only a hobby, he took it seriously. In his History of Electricity, he described the scientist as promoting the "security and happiness of mankind". Priestley's science was eminently practical and he rarely concerned himself with theoretical questions; his model was Benjamin Franklin. When he moved to Leeds, Priestley continued his electrical and chemical experiments (the latter aided by a steady supply of carbon dioxide from a neighbouring brewery). Between 1767 and 1770, he presented five papers to the Royal Society from these initial experiments; the first four papers explored coronal discharges and other phenomena related to electrical discharge, while the fifth reported on the conductivity of charcoals from different sources. His subsequent experimental work focused on chemistry and pneumatics.

Priestley published the first volume of his projected history of experimental philosophy, The History and Present State of Discoveries Relating to Vision, Light and Colours (referred to as his Optics), in 1772. He paid careful attention to the history of optics and presented excellent explanations of early optics experiments, but his mathematical deficiencies caused him to dismiss several important contemporary theories. Furthermore, he did not include any of the practical sections that had made his History of Electricity so useful to practising natural philosophers. Unlike his History of Electricity, it was not popular and had only one edition, although it was the only English book on the topic for 150 years. The hastily written text sold poorly; the cost of researching, writing, and publishing the Optics convinced Priestley to abandon his history of experimental philosophy.

Priestley was considered for the position of astronomer on James Cook's second voyage to the South Seas, but was not chosen. Still, he contributed in a small way to the voyage: he provided the crew with a method for making soda water, which he erroneously speculated might be a cure for scurvy. He then published a pamphlet with Directions for Impregnating Water with Fixed Air (1772). Priestley did not exploit the commercial potential of soda water, but others such as J. J. Schweppe made fortunes from it. For his discovery of soda water Priestley has been labelled “the father of the soft drink”, with the beverage company Schweppes regarding him as “the father of our industry”. In 1773, the Royal Society recognised Priestley's achievements in natural philosophy by awarding him the Copley Medal.

Priestley's friends wanted to find him a more financially secure position. In 1772, prompted by Richard Price and Benjamin Franklin, Lord Shelburne wrote to Priestley asking him to direct the education of his children and to act as his general assistant. Although Priestley was reluctant to sacrifice his ministry, he accepted the position, resigning from Mill Hill Chapel on 20 December 1772, and preaching his last sermon on 16 May 1773.

Calne (1773–80)

A portrait of Priestley commissioned by his publisher and close friend Joseph Johnson from Henry Fuseli (c. 1783)

 

In 1773, the Priestleys moved to Calne in Wiltshire, and a year later Lord Shelburne and Priestley took a tour of Europe. According to Priestley's close friend Theophilus Lindsey, Priestley was "much improved by this view of mankind at large". Upon their return, Priestley easily fulfilled his duties as librarian and tutor. The workload was intentionally light, allowing him time to pursue his scientific investigations and theological interests. Priestley also became a political adviser to Shelburne, gathering information on parliamentary issues and serving as a liaison between Shelburne and the Dissenting and American interests. When the Priestleys' third son was born on 24 May 1777, they named him Henry at the lord's request.

Materialist philosopher

By 1782, at least a dozen hostile refutations were published to Disquisitions relating to Matter and Spirit, and Priestley was branded an atheist.

 

Priestley wrote his most important philosophical works during his years with Lord Shelburne. In a series of major metaphysical texts published between 1774 and 1780—An Examination of Dr. Reid's Inquiry into the Human Mind (1774), Hartley's Theory of the Human Mind on the Principle of the Association of Ideas (1775), Disquisitions relating to Matter and Spirit (1777), The Doctrine of Philosophical Necessity Illustrated (1777), and Letters to a Philosophical Unbeliever (1780)—he argues for a philosophy that incorporates four concepts: determinism, materialism, causation, and necessitarianism. By studying the natural world, he argued, people would learn how to become more compassionate, happy, and prosperous.

Priestley strongly suggested that there is no mind-body duality, and put forth a materialist philosophy in these works; that is, one founded on the principle that everything in the universe is made of matter that we can perceive. He also contended that discussing the soul is impossible because it is made of a divine substance, and humanity cannot perceive the divine. Despite his separation of the divine from the mortal, this position shocked and angered many of his readers, who believed that such a duality was necessary for the soul to exist.

Responding to Baron d'Holbach's Système de la Nature (1770) and David Hume's Dialogues Concerning Natural Religion (1779) as well as the works of the French philosophers, Priestley maintained that materialism and determinism could be reconciled with a belief in God. He criticised those whose faith was shaped by books and fashion, drawing an analogy between the scepticism of educated men and the credulity of the masses.

Maintaining that humans had no free will, Priestley argued that what he called "philosophical necessity" (akin to absolute determinism) is consonant with Christianity, a position based on his understanding of the natural world. Like the rest of nature, man's mind is subject to the laws of causation, Priestley contended, but because a benevolent God created these laws, the world and the people in it will eventually be perfected. Evil is therefore only an imperfect understanding of the world.

Although Priestley's philosophical work has been characterised as "audacious and original", it partakes of older philosophical traditions on the problems of free will, determinism, and materialism. For example, the 17th-century philosopher Baruch Spinoza argued for absolute determinism and absolute materialism. Like Spinoza and Priestley, Leibniz argued that human will was completely determined by natural laws; however, unlike them, Leibniz argued for a "parallel universe" of immaterial objects (such as human souls) so arranged by God that its outcomes agree exactly with those of the material universe. Leibniz and Priestley share an optimism that God has chosen the chain of events benevolently; however, Priestley believed that the events were leading to a glorious Millennial conclusion, whereas for Leibniz the entire chain of events was optimal in and of itself, as compared with other conceivable chains of events.

Founder of Unitarianism

When Priestley's friend Theophilus Lindsey decided to found a new Christian denomination that would not restrict its members' beliefs, Priestley and others hurried to his aid. On 17 April 1774, Lindsey held the first Unitarian service in Britain, at the newly formed Essex Street Chapel in London; he had even designed his own liturgy, of which many were critical. Priestley defended his friend in the pamphlet Letter to a Layman, on the Subject of the Rev. Mr. Lindsey's Proposal for a Reformed English Church (1774), claiming that only the form of worship had been altered, not its substance, and attacking those who followed religion as a fashion. Priestley attended Lindsey's church regularly in the 1770s and occasionally preached there. He continued to support institutionalised Unitarianism for the rest of his life, writing several Defenses of Unitarianism and encouraging the foundation of new Unitarian chapels throughout Britain and the United States.

Experiments and Observations on Different Kinds of Air

Equipment used by Priestley in his experiments on gases, 1775

 

Priestley's years in Calne were the only ones in his life dominated by scientific investigations; they were also the most scientifically fruitful. His experiments were almost entirely confined to "airs", and out of this work emerged his most important scientific texts: the six volumes of Experiments and Observations on Different Kinds of Air (1774–86). These experiments helped repudiate the last vestiges of the theory of four elements, which Priestley attempted to replace with his own variation of phlogiston theory. According to that 18th-century theory, the combustion or oxidation of a substance corresponded to the release of a material substance, phlogiston.

Priestley's work on "airs" is not easily classified. As historian of science Simon Schaffer writes, it "has been seen as a branch of physics, or chemistry, or natural philosophy, or some highly idiosyncratic version of Priestley's own invention". Furthermore, the volumes were both a scientific and a political enterprise for Priestley, in which he argues that science could destroy "undue and usurped authority" and that government has "reason to tremble even at an air pump or an electrical machine".

Volume I of Experiments and Observations on Different Kinds of Air outlined several discoveries: "nitrous air" (nitric oxide, NO); "vapor of spirit of salt", later called "acid air" or "marine acid air" (anhydrous hydrochloric acid, HCl); "alkaline air" (ammonia, NH₃); "diminished" or "dephlogisticated nitrous air" (nitrous oxide, N₂O); and, most famously, "dephlogisticated air" (oxygen, O₂) as well as experimental findings that showed plants revitalised enclosed volumes of air, a discovery that would eventually lead to the discovery of photosynthesis. Priestley also developed a "nitrous air test" to determine the "goodness of air". Using a pneumatic trough, he would mix nitrous air with a test sample, over water or mercury, and measure the decrease in volume—the principle of eudiometry. After a small history of the study of airs, he explained his own experiments in an open and sincere style. As an early biographer writes, "whatever he knows or thinks he tells: doubts, perplexities, blunders are set down with the most refreshing candour." Priestley also described his cheap and easy-to-assemble experimental apparatus; his colleagues therefore believed that they could easily reproduce his experiments. Faced with inconsistent experimental results, Priestley employed phlogiston theory. This, however, led him to conclude that there were only three types of "air": "fixed", "alkaline", and "acid". Priestley dismissed the burgeoning chemistry of his day. Instead, he focused on gases and "changes in their sensible properties", as had natural philosophers before him. He isolated carbon monoxide (CO), but apparently did not realise that it was a separate "air".

Discovery of oxygen

The laboratory at Lord Shelburne's estate, Bowood House, in which Priestley discovered oxygen

 

In August 1774 he isolated an "air" that appeared to be completely new, but he did not have an opportunity to pursue the matter because he was about to tour Europe with Shelburne. While in Paris, however, Priestley managed to replicate the experiment for others, including French chemist Antoine Lavoisier. After returning to Britain in January 1775, he continued his experiments and discovered "vitriolic acid air" (sulphur dioxide, SO₂). 

In March he wrote to several people regarding the new "air" that he had discovered in August. One of these letters was read aloud to the Royal Society, and a paper outlining the discovery, titled "An Account of further Discoveries in Air", was published in the Society's journal Philosophical Transactions. Priestley called the new substance "dephlogisticated air", which he made in the famous experiment by focusing the sun's rays on a sample of mercuric oxide. He first tested it on mice, who surprised him by surviving quite a while entrapped with the air, and then on himself, writing that it was "five or six times better than common air for the purpose of respiration, inflammation, and, I believe, every other use of common atmospherical air". He had discovered oxygen gas (O₂). 

William Petty, 2nd Earl of Shelburne – a fellow Unitarian – built a laboratory for the famous dissenter at Bowood House.

 

Priestley assembled his oxygen paper and several others into a second volume of Experiments and Observations on Air, published in 1776. He did not emphasise his discovery of "dephlogisticated air" (leaving it to Part III of the volume) but instead argued in the preface how important such discoveries were to rational religion. His paper narrated the discovery chronologically, relating the long delays between experiments and his initial puzzlements; thus, it is difficult to determine when exactly Priestley "discovered" oxygen. Such dating is significant as both Lavoisier and Swedish pharmacist Carl Wilhelm Scheele have strong claims to the discovery of oxygen as well, Scheele having been the first to isolate the gas (although he published after Priestley) and Lavoisier having been the first to describe it as purified "air itself entire without alteration" (that is, the first to explain oxygen without phlogiston theory).

In his paper "Observations on Respiration and the Use of the Blood", Priestley was the first to suggest a connection between blood and air, although he did so using phlogiston theory. In typical Priestley fashion, he prefaced the paper with a history of the study of respiration. A year later, clearly influenced by Priestley, Lavoisier was also discussing respiration at the Académie des sciences. Lavoisier's work began the long train of discovery that produced papers on oxygen respiration and culminated in the overthrow of phlogiston theory and the establishment of modern chemistry.

Around 1779 Priestley and Shelburne had a rupture, the precise reasons for which remain unclear. Shelburne blamed Priestley's health, while Priestley claimed Shelburne had no further use for him. Some contemporaries speculated that Priestley's outspokenness had hurt Shelburne's political career. Schofield argues that the most likely reason was Shelburne's recent marriage to Louisa Fitzpatrick—apparently, she did not like the Priestleys. Although Priestley considered moving to America, he eventually accepted Birmingham New Meeting's offer to be their minister.

Both Priestley and Shelburne's families upheld their Unitarian faith for generations. In December 2013, it was reported that Sir Christopher Bullock – a direct descendant of Shelburne's brother, Thomas Fitzmaurice (MP) – had married his wife, Lady Bullock, née Barbara May Lupton, at London's Unitarian Essex Church in 1917. Barbara Lupton was the second cousin of Olive Middleton, née Lupton, the great grandmother of Catherine, Duchess of Cambridge. In 1914, Olive and Noel Middleton had married at Leeds' Mill Hill Chapel, which Priestly, as its minister, had once guided towards Unitarianism.

Birmingham (1780–91)

In 1780 the Priestleys moved to Birmingham and spent a happy decade surrounded by old friends, until they were forced to flee in 1791 by religiously motivated mob violence in what became known as the Priestley Riots. Priestley accepted the ministerial position at New Meeting on the condition that he be required to preach and teach only on Sundays, so that he would have time for his writing and scientific experiments. As in Leeds, Priestley established classes for the youth of his parish and by 1781, he was teaching 150 students. Because Priestley's New Meeting salary was only 100 guineas, friends and patrons donated money and goods to help continue his investigations. He was elected a Foreign Honorary Member of the American Academy of Arts and Sciences in 1782.

Chemical Revolution

One of a set of Lunar Society Moonstones commemorating Priestley at Great Barr, Birmingham

 

Many of the friends that Priestley made in Birmingham were members of the Lunar Society, a group of manufacturers, inventors, and natural philosophers who assembled monthly to discuss their work. The core of the group included men such as the manufacturer Matthew Boulton, the chemist and geologist James Keir, the inventor and engineer James Watt, and the botanist, chemist, and geologist William Withering. Priestley was asked to join this unique society and contributed much to the work of its members. As a result of this stimulating intellectual environment, he published several important scientific papers, including "Experiments relating to Phlogiston, and the seeming Conversion of Water into Air" (1783). The first part attempts to refute Lavoisier's challenges to his work on oxygen; the second part describes how steam is "converted" into air. After several variations of the experiment, with different substances as fuel and several different collecting apparatuses (which produced different results), he concluded that air could travel through more substances than previously surmised, a conclusion "contrary to all the known principles of hydrostatics". This discovery, along with his earlier work on what would later be recognised as gaseous diffusion, would eventually lead John Dalton and Thomas Graham to formulate the kinetic theory of gases.

Antoine Lavoisier and his wife, Marie-Anne Pierrette Paulze, by Jacques-Louis David, 1788

 

In 1777, Antoine Lavoisier had written Mémoire sur la combustion en général, the first of what proved to be a series of attacks on phlogiston theory; it was against these attacks that Priestley responded in 1783. While Priestley accepted parts of Lavoisier's theory, he was unprepared to assent to the major revolutions Lavoisier proposed: the overthrow of phlogiston, a chemistry based conceptually on elements and compounds, and a new chemical nomenclature. Priestley's original experiments on "dephlogisticated air" (oxygen), combustion, and water provided Lavoisier with the data he needed to construct much of his system; yet Priestley never accepted Lavoisier's new theories and continued to defend phlogiston theory for the rest of his life. Lavoisier's system was based largely on the quantitative concept that mass is neither created nor destroyed in chemical reactions (i.e., the conservation of mass). By contrast, Priestley preferred to observe qualitative changes in heat, color, and particularly volume. His experiments tested "airs" for "their solubility in water, their power of supporting or extinguishing flame, whether they were respirable, how they behaved with acid and alkaline air, and with nitric oxide and inflammable air, and lastly how they were affected by the electric spark."

By 1789, when Lavoisier published his Traité Élémentaire de Chimie and founded the Annales de Chimie, the new chemistry had come into its own. Priestley published several more scientific papers in Birmingham, the majority attempting to refute Lavoisier. Priestley and other Lunar Society members argued that the new French system was too expensive, too difficult to test, and unnecessarily complex. Priestley in particular rejected its "establishment" aura. In the end, Lavoisier's view prevailed: his new chemistry introduced many of the principles on which modern chemistry is founded.

Priestley's refusal to accept Lavoisier's "new chemistry"—such as the conservation of mass—and his determination to adhere to a less satisfactory theory has perplexed many scholars. Schofield explains it thus: "Priestley was never a chemist; in a modern, and even a Lavoisierian, sense, he was never a scientist. He was a natural philosopher, concerned with the economy of nature and obsessed with an idea of unity, in theology and in nature." Historian of science John McEvoy largely agrees, writing that Priestley's view of nature as coextensive with God and thus infinite, which encouraged him to focus on facts over hypotheses and theories, prompted him to reject Lavoisier's system. McEvoy argues that "Priestley's isolated and lonely opposition to the oxygen theory was a measure of his passionate concern for the principles of intellectual freedom, epistemic equality and critical inquiry." Priestley himself claimed in the last volume of Experiments and Observations that his most valuable works were his theological ones because they were "superior [in] dignity and importance".

Defender of English Dissenters and French revolutionaries

DOCTOR PHLOGISTON,
The PRIESTLEY politician or the Political Priest
This anti-Priestley cartoon shows him trampling on the Bible and burning documents representing English freedom. "Essays on Matter and Spirit", "Gunpowder", and "Revolution Toasts" bulge from his pockets.

 

Although Priestley was busy defending phlogiston theory from the "new chemists", most of what he published in Birmingham was theological. In 1782 he published the fourth volume of his Institutes, An History of the Corruptions of Christianity, describing how he thought the teachings of the early Christian church had been "corrupted" or distorted. Schofield describes the work as "derivative, disorganized, wordy, and repetitive, detailed, exhaustive, and devastatingly argued". The text addresses issues ranging from the divinity of Christ to the proper form for the Lord's Supper. Priestley followed up in 1786 with the provocatively titled book, An History of Early Opinions concerning Jesus Christ, compiled from Original Writers, proving that the Christian Church was at first Unitarian. Thomas Jefferson would later write of the profound effect that these two books had on him: "I have read his Corruptions of Christianity, and Early Opinions of Jesus, over and over again; and I rest on them ... as the basis of my own faith. These writings have never been answered." Although a few readers such as Jefferson and other Rational Dissenters approved of the work, it was harshly reviewed because of its extreme theological positions, particularly its rejection of the Trinity.

In 1785, while Priestley was engaged in a pamphlet war over Corruptions, he also published The Importance and Extent of Free Enquiry, claiming that the Reformation had not really reformed the church. In words that would boil over into a national debate, he challenged his readers to enact change:

Let us not, therefore, be discouraged, though, for the present, we should see no great number of churches professedly unitarian .... We are, as it were, laying gunpowder, grain by grain, under the old building of error and superstition, which a single spark may hereafter inflame, so as to produce an instantaneous explosion; in consequence of which that edifice, the erection of which has been the work of ages, may be overturned in a moment, and so effectually as that the same foundation can never be built upon again ....

Although discouraged by friends from using such inflammatory language, Priestley refused to back down from his opinions in print and he included it, forever branding himself as "Gunpowder Joe". After the publication of this seeming call for revolution in the midst of the French Revolution, pamphleteers stepped up their attacks on Priestley and he and his church were even threatened with legal action.

"A Word of Comfort" by William Dent (dated 22 March 1790). Priestley is preaching in front of Charles James Fox who asks "Pray, Doctor, is there such a thing as a Devil?", to which Priestley responds "No" while the devil prepares to attack Priestley from behind.

 

In 1787, 1789, and 1790, Dissenters again tried to repeal the Test and Corporation Acts. Although initially it looked as if they might succeed, by 1790, with the fears of revolution looming in Parliament, few were swayed by appeals to equal rights. Political cartoons, one of the most effective and popular media of the time, skewered the Dissenters and Priestley. In Parliament, William Pitt and Edmund Burke argued against the repeal, a betrayal that angered Priestley and his friends, who had expected the two men's support. Priestley wrote a series of Letters to William Pitt and Letters to Burke in an attempt to persuade them otherwise, but these publications only further inflamed the populace against him. 

Dissenters such as Priestley who supported the French Revolution came under increasing suspicion as scepticism regarding the revolution grew. In its propaganda against "radicals", Pitt's administration used the "gunpowder" statement to argue that Priestley and other Dissenters wanted to overthrow the government. Burke, in his famous Reflections on the Revolution in France (1790), tied natural philosophers, and specifically Priestley, to the French Revolution, writing that radicals who supported science in Britain "considered man in their experiments no more than they do mice in an air pump". Burke also associated republican principles with alchemy and insubstantial air, mocking the scientific work done by both Priestley and French chemists. He made much in his later writings of the connections between "Gunpowder Joe", science, and Lavoisier—who was improving gunpowder for the French in their war against Britain. Paradoxically, a secular statesman, Burke, argued against science and maintained that religion should be the basis of civil society, whereas a Dissenting minister, Priestley, argued that religion could not provide the basis for civil society and should be restricted to one's private life.

Birmingham riots of 1791

The attack on Priestley's home, Fairhill, Sparkbrook, Birmingham

 

The animus that had been building against Dissenters and supporters of the American and French Revolutions exploded in July 1791. Priestley and several other Dissenters had arranged to have a celebratory dinner on the anniversary of the storming of the Bastille, a provocative action in a country where many disapproved of the French Revolution and feared that it might spread to Britain. Amid fears of violence, Priestley was convinced by his friends not to attend. Rioters gathered outside the hotel during the banquet and attacked the attendees as they left. The rioters moved on to the New Meeting and Old Meeting churches—and burned both to the ground. Priestley and his wife fled from their home; although their son William and others stayed behind to protect their property, the mob overcame them and torched Priestley's house "Fairhill" at Sparkbrook, destroying his valuable laboratory and all of the family's belongings. Twenty-six other Dissenters’ homes and three more churches were burned in the three-day riot. Priestley spent several days hiding with friends until he was able to travel safely to London. The carefully executed attacks of the "mob" and the farcical trials of only a handful of the "leaders" convinced many at the time—and modern historians later—that the attacks were planned and condoned by local Birmingham magistrates. When George III was eventually forced to send troops to the area, he said: "I cannot but feel better pleased that Priestley is the sufferer for the doctrines he and his party have instilled, and that the people see them in their true light."

Hackney (1791–94)

... Lo! Priestley there, patriot, and saint, and sage,
Him, full of years, from his loved native land
Statesmen blood-stained and priests idolatrous
By dark lies maddening the blind multitude
Drove with vain hate ....
From "Religious Musings" (1796) by Samuel Taylor Coleridge

Unable to return to Birmingham, the Priestleys eventually settled in Lower Clapton, a district in Hackney, Middlesex where he gave a series of lectures on history and natural philosophy at the Dissenting academy, the New College at Hackney. Friends helped the couple rebuild their lives, contributing money, books, and laboratory equipment. Priestley tried to obtain restitution from the government for the destruction of his Birmingham property, but he was never fully reimbursed. He also published An Appeal to the Public on the Subject of the Riots in Birmingham (1791), which indicted the people of Birmingham for allowing the riots to occur and for "violating the principles of English government".

The Friends of the People, 15 November 1792, caricaturing Joseph Priestley and Thomas Paine (Science History Institute)

 

Dumourier Dining in State at St James's, on 15 May 1793 by James Gillray: Priestley bears a mitre-crowned pie, as he, Fox and Sheridan serve Dumourier

 

The couple's friends urged them to leave Britain and emigrate to either France or the new United States, even though Priestley had received an appointment to preach for the Gravel Pit Meeting congregation. Priestley was minister between 1793 and 1794 and the sermons he preached there, particularly the two Fast Sermons, reflect his growing millenarianism, his belief that the end of the world was fast approaching. After comparing Biblical prophecies to recent history, Priestley concluded that the French Revolution was a harbinger of the Second Coming of Christ. Priestley's works had always had a millennial cast, but after the beginning of the French Revolution, this strain increased. He wrote to a younger friend that while he himself would not see the Second Coming, his friend "may probably live to see it ... It cannot, I think be more than twenty years [away]."

Daily life became more difficult for the family: Priestley was burned in effigy along with Thomas Paine; vicious political cartoons continued to be published about him; letters were sent to him from across the country, comparing him to the devil and Guy Fawkes; tradespeople feared the family's business; and Priestley's Royal Academy friends distanced themselves. As the penalties became harsher for those who spoke out against the government, Priestley examined options for removing himself and his family from England. 

Joseph Priestley's son William was presented to the French Assembly and granted letters of naturalization on 8 June 1792. Priestley learned about it from the Morning Chronicle. A decree of 26 August 1792 by the French National Assembly conferred French citizenship on Joseph Priestley and others who had "served the cause of liberty" by their writings. Priestley accepted French citizenship, considering it "the greatest of honours". In the French National Convention election on 5 September 1792, Joseph Priestley was elected to the French National Convention by at least two departments, (Orne and Rhône-et-Loire). However, he declined the honour, on the grounds that he was not fluent in French.

As relations between England and France worsened, however, a removal to France became impracticable. Following the declaration of war of February 1793, and the Aliens Bill of March 1793, which forbade correspondence or travel between England and France, William Priestley left France for America. Joseph Priestley's sons Harry and Joseph chose to leave England for America in August 1793. Finally Priestley himself followed with his wife, boarding the Sansom at Gravesend on 7 April 1794. Five weeks after Priestley left, William Pitt's administration began arresting radicals for seditious libel, resulting in the famous 1794 Treason Trials.

Pennsylvania (1794–1804)

Priestley, painted late in life by Rembrandt Peale (c. 1800);^[160] Americans knew Priestley less as a man of science and more as a defender of the freedom of the colonies and of Dissenters.

The Priestleys arrived in New York City on 4 June 1794, where they were fêted by various political factions vying for Priestley's endorsement. Priestley declined their entreaties, hoping to avoid political discord in his new country. Before travelling to a new home in the backwoods of Northumberland County, Pennsylvania, at Point township (now the Borough of Northumberland), Dr and Mrs Priestley lodged in Philadelphia, where Priestley gave a series of sermons which led to the founding of the First Unitarian Church of Philadelphia. Priestley turned down an opportunity to teach chemistry at the University of Pennsylvania.

Priestley's son Joseph Priestley Jr. was a leading member of a consortium that had purchased 300,000 acres of virgin woodland between the forks of Loyalsock Creek, which they intended to lease or sell in 400-acre plots, with payment deferred to seven annual instalments, with interest. His brothers, William and Henry, bought a 284-acre plot of woodland which they attempted to transform into a farm, later called "Fairhill", felling and uprooting trees, and making lime to sweeten the soil by building their own lime kilns. Henry Priestley died 11 December 1795, possibly of malaria which he may have contracted after landing at New York. Mary Priestley's health, already poor, deteriorated further; although William's wife, Margaret Foulke-Priestley, moved in with the couple to nurse Mary twenty-four hours a day, Mary Priestley died 17 September 1796. Dr Priestley now moved in with his elder son, Joseph Jr., and his wife Elizabeth Ryland-Priestley. Thomas Cooper, whose son, Thomas Jr., was living with the Priestleys, was a frequent visitor. 

Since his arrival in America, Priestley had continued to defend his Christian Unitarian beliefs; now, falling increasingly under the influence of Thomas Cooper and Elizabeth Ryland-Priestley, he was unable to avoid becoming embroiled in political controversy. In 1798, when, in response to the Pinckney affair, a belligerent President Adams sought to enlarge the navy and mobilise the militia into what Priestley and Cooper saw as a 'standing army', Priestley published an anonymous newspaper article: Maxims of political arithmetic, which attacked Adams, defended free trade, and advocated a form of Jeffersonian isolationism. In the same year, a small package, addressed vaguely: "Dr Priestley in America," was seized by the Royal Navy on board a neutral Danish boat. It was found to contain three letters, one of which was signed by the radical printer John Hurford Stone. These intercepted letters were published in London, and copied in numerous papers in America. One of the letters was addressed to "MBP", with a note: "I inclose a note for our friend MBP—but, as ignorant of the name he bears at present among you, I must beg you to seal and address it." This gave the intercepted letters a tinge of intrigue. Fearful lest they be taken as evidence of him being a 'spy in the interest of France', Priestley sent a clumsy letter to numerous newspaper editors, in which he naively named "MBP" (Member of the British Parliament) as Mr. Benjamin Vaughan, who "like me, thought it necessary to leave England, and for some time is said to have assumed a feigned name." William Cobbett, in his Porcupine's Gazette, 20 August 1798, added that Priestley "has told us who Mr MBP is, and has confirmed me in the opinion of their both being spies in the interest of France."

The Priestleys' rural Pennsylvania home never became the center of a utopian community, as the expected emigrants could not afford the journey.

 

Joseph Priestley Jr. left on a visit to England at Christmas 1798, not returning until August 1800. In his absence, his wife Elizabeth Ryland-Priestley and Thomas Cooper became increasing close, collaborating in numerous political essays. Priestley allowed himself to fall too heavily under Elizabeth and Cooper's influences, even helping hawk a seditious handbill Cooper had printed, around Point township, and across the Susquehanna at Sunbury. In September 1799, William Cobbett printed extracts from this handbill, asserting that: "Dr Priestley has taken great pains to circulate this address, has travelled through the country for the purpose, and is in fact the patron of it." He challenged Priestley to "clear himself of the accusation" or face prosecution." Barely a month later, in November and December 1799, Priestley stepped forward in his own defence, with his Letters to the inhabitants of Northumberland.

Priestley's original 1804 gravestone in Riverview Cemetery, Northumberland, Pennsylvania. Visible at right is part of the new stone, placed in front of it in 1971.

 

Priestley’s son, William, now living in Philadelphia, was increasingly embarrassed by his father's actions. He confronted his father, expressing John and Benjamin Vaughan’s unease, his own wife's concerns about Elizabeth Ryland-Priestley's dietary care, and his own concerns at the closeness of Elizabeth Ryland-Priestley and Thomas Cooper's relationship, and their adverse influence on Dr Priestley; but this only led to a further estrangement between William and his sister-in-law. When, a while later, Priestley's household suffered a bout of food poisoning, perhaps from milk sickness or a bacterial infection, Elizabeth Ryland-Priestley, falsely accused William of having poisoned the family's flour. Although this allegation has attracted the attention of some modern historians, it is believed to be without foundation.

Priestley continued the educational projects that had always been important to him, helping to establish the "Northumberland Academy" and donating his library to the fledgling institution. He exchanged letters regarding the proper structure of a university with Thomas Jefferson, who used this advice when founding the University of Virginia. Jefferson and Priestley became close, and when he had completed his General History of the Christian Church, he dedicated it to President Jefferson, writing that "it is now only that I can say I see nothing to fear from the hand of power, the government under which I live being for the first time truly favourable to me."

Priestley tried to continue his scientific investigations in America with the support of the American Philosophical Society. He was hampered by lack of news from Europe; unaware of the latest scientific developments, Priestley was no longer on the forefront of discovery. Although the majority of his publications focused on defending phlogiston theory, he also did some original work on spontaneous generation and dreams. Despite Priestley's reduced scientific output, his presence stimulated American interest in chemistry.

By 1801, Priestley had become so ill that he could no longer write or experiment. He died on the morning of 6 February 1804, aged seventy and was buried at Riverview Cemetery in Northumberland, Pennsylvania.

Priestley's epitaph reads:

Return unto thy rest, O my soul, for the
Lord hath dealt bountifully with thee.
I will lay me down in peace and sleep till
I awake in the morning of the resurrection.

Legacy

Statue of Priestley by Francis John Williamson, in Chamberlain Square, Birmingham, England

 

Statue of Priestly in City Square, Leeds, England

 

By the time he died in 1804, Priestley had been made a member of every major scientific society in the Western world and he had discovered numerous substances. The 19th-century French naturalist George Cuvier, in his eulogy of Priestley, praised his discoveries while at the same time lamenting his refusal to abandon phlogiston theory, calling him "the father of modern chemistry [who] never acknowledged his daughter". Priestley published more than 150 works on topics ranging from political philosophy to education to theology to natural philosophy. He led and inspired British radicals during the 1790s, paved the way for utilitarianism, and helped found Unitarianism. A wide variety of philosophers, scientists, and poets became associationists as a result of his redaction of David Hartley's Observations on Man, including Erasmus Darwin, Coleridge, William Wordsworth, John Stuart Mill, Alexander Bain, and Herbert Spencer. Immanuel Kant praised Priestley in his Critique of Pure Reason (1781), writing that he "knew how to combine his paradoxical teaching with the interests of religion". Indeed, it was Priestley's aim to "put the most 'advanced' Enlightenment ideas into the service of a rationalized though heterodox Christianity, under the guidance of the basic principles of scientific method".

Considering the extent of Priestley's influence, relatively little scholarship has been devoted to him. In the early 20th century, Priestley was most often described as a conservative and dogmatic scientist who was nevertheless a political and religious reformer. In a historiographic review essay, historian of science Simon Schaffer describes the two dominant portraits of Priestley: the first depicts him as "a playful innocent" who stumbled across his discoveries; the second portrays him as innocent as well as "warped" for not understanding their implications better. Assessing Priestley's works as a whole has been difficult for scholars because of his wide-ranging interests. His scientific discoveries have usually been divorced from his theological and metaphysical publications to make an analysis of his life and writings easier, but this approach has been challenged recently by scholars such as John McEvoy and Robert Schofield. Although early Priestley scholarship claimed that his theological and metaphysical works were "distractions" and "obstacles" to his scientific work, scholarship published in the 1960s, 1970s, and 1980s maintained that Priestley's works constituted a unified theory. However, as Schaffer explains, no convincing synthesis of his work has yet been expounded. More recently, in 2001, historian of science Dan Eshet has argued that efforts to create a "synoptic view" have resulted only in a rationalisation of the contradictions in Priestley's thought, because they have been "organized around philosophical categories" and have "separate[d] the producers of scientific ideas from any social conflict".

A blue plaque from the Royal Society of Chemistry commemorates Priestley at New Meeting Street, Birmingham

 

Priestley has been remembered by the towns in which he served as a reforming educator and minister and by the scientific organisations he influenced. Two educational institutions have been named in his honour—Priestley College in Warrington and Joseph Priestley College in Leeds (now part of Leeds City College)—and an asteroid, 5577 Priestley, discovered in 1986 by Duncan Waldron. In Birstall, the Leeds City Square, and in Birmingham, he is memorialised through statues, and plaques commemorating him have been posted in Birmingham, Calne and Warrington. Also, since 1952 Dickinson College, Pennsylvania, has presented the Priestley Award to a scientist who makes "discoveries which contribute to the welfare of mankind". The main undergraduate chemistry laboratories at the University of Leeds were refurbished as part of a £4m refurbishment plan in 2006 and renamed as the Priestley Laboratories in his honour as a prominent chemist from Leeds. In 2016 the University of Huddersfield renamed the building housing its Applied Sciences department as the Joseph Priestley Building, as part of an exercise to rename all campus buildings after prominent local figures.

Additional recognition for Priestley's work is marked by a National Historic Chemical Landmark designation for his discovery of oxygen, made on 1 August 1994, at the Priestley House in Northumberland, Penn., by the American Chemical Society. Similar recognition was made on 7 August 2000, at Bowood House in Wiltshire, England. The ACS also awards their highest honour, the Priestley Medal, in his name.

Selected works

• The Rudiments of English Grammar (1761)
• A Chart of Biography (1765)
• Essay on a Course of Liberal Education for Civil and Active Life (1765)
• The History and Present State of Electricity (1767)
• Essay on the First Principles of Government (1768)
• A New Chart of History (1769)
• Institutes of Natural and Revealed Religion (1772–74)
• Experiments and Observations on Different Kinds of Air (1774–77)
• Disquisitions relating to Matter and Spirit (1777)
• The Doctrine of Philosophical Necessity Illustrated (1777)
• Letters to a Philosophical Unbeliever (1780)
• An History of the Corruptions of Christianity (1782)
• Lectures on History and General Policy (1788)
• Theological Repository (1770–73, 1784–88)