Terrasson, Jean brother of the two preceding, was born at Lyons in 1670, where he also studied, and entered the Oratory. In 1707 he was admitted into the Academy of Sciences, and he entered into the literary discussions of the day. In 1721 he became professor of philosophy in the College of France, and in 1732 he was made a member of the French Academy. Towards the end of his life he lost his memory. He died in. Paris, Sept. 15, 1750. He published a number of historical works. See Hoefer, Nouv. Biog. Géneralé, s.v.