Priestley was an English theologian and scientist. He prepared for the Presbyterian ministry but gradually rejected orthodox Calvinism for Unitarianism. His History of the Corruptions of Christianity, published in 1782, was officially burned in 1785, and he immigrated to the US in 1794, befriending the nation’s founders. As a scientist, his manipulation of gases enabled him to discover new ones, including “dephlogisticated air,” a breakthrough whose magnitude escaped him. What gas was it? Discuss