Aler, Paul a learned German Jesuit, was born at Saint Guy, in Luxemburg, Nov. 9, 1656. He studied at Cologne; and in 1676 entered the Order of St. Ignatius. He was professor of philosophy, theology, and belles-lettres at Cologne until 1691. In 1701 he was invited to the University of Treves, where he gave a course of lectures on theology; and in 1703 was appointed regent of the gymnasium school. About the same time he was employed in the organization and direction of the gymnasial academies of Munster, Aix- la-Chapelle, Treves, and Juliers. He died at Diren in 1727, and left as his principal works, Tractatus de Artibus Humanis (Treves, 1717 4to): — Philosophine Tripartite Pars I, sire Logica (Cologne, 1710); Pars II, sive Physica (1715); Pars III, seu Anima et Metaphysica (1724): — and some classic annotations, etc. See Biog. Universelle; Chalmers. Biog. Dict. s.v.; Hoefer, Nouv. Biog. Generale, s.v.