Thomas Percival, an English physician, born in Warrington, Lancashire, Sept. 29, 1740, died in Manchester, Aug. 30, 1804. He was educated at the Warrington academy and at Edinburgh, and received the degree of M. D. at Leyden in 1765. In 1767 he settled at Manchester in the practice of his profession, and in 1781 founded the Manchester literary and philosophical society. In the latter years of his life he turned his attention to moral philosophy, and several of his works on that subject became very popular. In religion he was a dissenter. He wrote a large number of works, most of the earlier of which appeared originally in the " Philosophical Transactions " of London or Manchester, and were republished under the title of " Essays, Medical and Experimental" (3 vols. 8vo, 1767-78). Among his other works are: "A Father's Instructions, consisting of Moral Tales, Fables, and Reflections, designed to promote the Love of Virtue " (2 vols. 8vo, 1775-'7); "Moral and Literary Dissertations" (8vo, Warrington, 1784); and "Medical Ethics, or a Code of Institutes and Precepts adapted to the Professional Conduct of Physicians and Surgeons" (8vo, Manchester, 1803). After his death his works were collected, with a memoir and letters, by his son (4 vols. 8vo, London, 1807).