a Presbyterian divine, brother of Samuel Blair (q.v.), was born in Ireland 1720, and emigrated in his youth to America. He studied at the "Log College," and in 1742 was ordained pastor of three churches in Cumberland Co., Pa. In 1757 he removed to Fagg's Manor. In 1767 he was appointed professor of divinity and vice-president of the college at Princeton. In 1769 he became pastor at Walkill, N. Y., where he remained until his death, Dec. 8,1771. He published a Treatise on Regeneration, another on Terms of Admission to the Lord's Supper, and several sermons. Sprague, Annals, 3:118.