THOMAS ADDIS EMMET (1764-1827), Irish lawyer and politician, second son of Robert Emmet, physician to the lordlieutenant of Ireland, and elder brother of Robert Emmet (q.v.), the rebel, was born at Cork on the 24th of April 1764, and was educated at Trinity College, Dublin, and at Edinburgh University, where he studied medicine and was a pupil of Dugald Stewart in philosophy.
Tested by the power and effect of his teaching influence, Cousin occupies a foremost place in the rank of professors of philosophy, who like Jacobi, Schelling and Dugald Stewart have united the gifts of speculative, expository and imaginative power.
In 1785 when Dugald Stewart succeeded Ferguson in the Edinburgh chair of moral philosophy, Playfair succeeded the former in that of mathematics.
His philosophical influence was exerted largely through the writings of Dugald Stewart and Sir William Hamilton.
After twice failing in the attempt to gain a professorship in the university, he was invited, during an illness of Dugald Stewart in the session of 1808-1809, to act as his substitute, and during the following session he undertook a great part of Stewart's work.
Contemporary with Reid and even more popular in treatment was James Beattie; Dugald Stewart with trivial modifications followed Reid; but in Sir W.