Was a scientist by heart. His first interest was that of Theology. He was a great experimentalist, but his explanations were usually wrong.
He investigated fixed air (CO2), which made soda water.
He learned that by heat and other means, he could discover many gases like (HCl, NO, N2O, NO2, NH3, N2, CO, SO2, SiF4, and O2).
He heated HgO to make O2, and he recommended its use in medicine.