Percival, Thomas, M.D., F.R.S. (1740-1804), a distinguished physician, was born at Warrington, and was educated there, after which he studied medicine at Edinburgh, and gained his degree at Leyden in 1765. Settling in Manchester, he acquired a large practice, and made various successful scientific experiments. He wrote largely on physical science, and in 1774-76 published his Esso/ys, Medical and Experimental (3 vols.). He contributed largely to the Transactions of the Royal Society, and his most important papers appeared posthumously in four volumes in 1807.