Joseph Priestley

Joseph Priestley (; 24 March 1733 – 6 February 1804) was an English chemist, natural philosopher, separatist theologian, grammarian, multi-subject educator, and liberal political theorist who published over 150 works. He has historically been credited with the independent discovery of oxygen in 1774 by the thermal decomposition of mercuric oxide, having isolated it. Although Swedish chemist Carl Wilhelm Scheele also has strong claims to the discovery, Priestley published his findings first. Scheele discovered it by heating potassium nitrate, mercuric oxide, and many other substances about 1772.

During his lifetime, Priestley's considerable scientific reputation rested on his invention of carbonated water, his writings on electricity, and his discovery of several "airs" (gases), the most famous being what Priestley dubbed "dephlogisticated air" (oxygen). 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.

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2
by Priestley, Joseph
Published 1792
printed by J. Thompson; sold by J. Johnson, St. Paul's Church-Yard, London

4
by Priestley, Joseph
Published 1792
printed by Hillary and Barlow, for Messrs. P. Byrne, A. Grueber, J. Moore, and R. White

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by Priestley, Joseph
Published 1794
Printed by Thomas Dobson, at the stone-house no 41, South Second-Street
Other Authors: '; ...Priestley, Joseph...

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by Priestley, Joseph
Published 1794
Birmingham--printed. New-York: re-printed by J. Harrisson, for B. Gomez, bookseller and stationer, no. 97, Maiden-Lane

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by Priestley, Joseph
Published 1796
Printed by J. Springer, for T.C. Green, and S. Green; and J. Trumbull, Norwich

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by Priestley, Joseph
Published 1797
Printed for Thomas Dobson, no. 41, South Second Street

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by Priestley, Joseph
Published 1796
Printed by Thomas Dobson, at the stone-house, no 41, South Second-Street

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by Priestley, Joseph
Published 1795
Printed by Thomas Dobson, at the stone-house, no. 41, South Second-Street

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by Priestley, Joseph
Published 1791
Birmingham: printed: New-York: re-printed by Hugh Gaine, at the Bible, in Hanover-Square

13
by Priestley, Joseph
Published 1777
Printed for J. Johnson, No. 72, St. Paul's Churchyard

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by Priestley, Joseph
Published 1788
Printed for the author, by Pearson and Rollason, and sold by J. Johnson

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by Priestley, Joseph
Published 1791
Sold by J. Johnson

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by Priestley, Joseph
Published 1791
Sold by J. Johnson

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by Priestley, Joseph
Published 1791
Sold by J. Johnson

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by Priestley, Joseph
Published 1826
Printed for T. Tegg