Chemistry and Geology
He was an enthusiastic chemist and geologist. He conducted a series of experiments on Terra Ponderosa, a heavy ore from Cumberland, England. He deduced that it contained a hitherto undescribed element which he was unable to characterise. It was later shown to be barium carbonate and in 1789 the eminent German geologist Abraham Gottlob Werner named the mineral Witherite in his honour. He also undertook analyses of the mineral content of a number of spa waters in England and abroad, notably at the medicinal spa at Caldas da Rainha in Portugal. This latter undertaking occurred during the winter of 1793-4, and he was subsequently elected to the Fellowship of the Royal Academy of Sciences of Portugal.
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