"In 1774 he thought he had obtained nitrous oxide... in 1775 he saw the gas as dephlogisticated air... If we refuse the palm to Priestley, we cannot award it to Lavoisier for the work of 1775... Lavoisier insisted that oxygen was an atomic "principle of acidity"… formed only when that "principle" united with "caloric"... Ignoring Scheele, we can safely say that oxygen had not been discovered before 1774, and we would probably say that it had been discovered by 1777 or shortly thereafter. But... any attempt to date the discovery must inevitably be arbitrary because discovering a new sort of phenomenon is necessarily a complex event, one which involves recognizing both that something is and what it is."
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Thomas Samuel Kuhn, The Structure of Scientific Revolutions (1962)
https://en.wikiquote.org/wiki/Joseph_Priestley
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Joseph Priestley
Joseph Priestley (13 March 1733 – 6 February 1804) was an English Unitarian clergyman, theologian, political theorist, and the scientist who is usually credited with the discovery of oxygen, as he was the first to isolate it in its gaseous state.
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