Heinrich Ahrens, a German jurist and psychologist, born at Kniestedt, Hanover, July 14, 1808. He studied at Gottingen, and was implicated in the political disturbances of 1831, afterward lectured in Paris on German philosophy and psychology, and from 1834 to 1848 was professor of philosophy at Brussels, declining invitations from the universities of Leyden and Utrecht. In 1848 he was a member of the Frankfort parliament and of the committee appointed to draw up a German constitu-tution. In 1850 he was appointed professor at Gratz, and since 1859 he has been connected with the university of Leipsic, which he represents in the first Saxon chamber. He has published in French Cours de psychologic (2 vols., Paris, 1837-'8), and Cours du droit naturel (Paris, 1838; 5th ed., 1860). He published a German version of the latter under the title of Die Rechtsphilosophie, oder das Naturrecht auf phi-losophisch-anthropologischer Grundlage (Vienna, 1851). This work has also been translated into Italian, Spanish, Portuguese, and Hungarian, and is used as a basis for academical studies in Brazil, Peru, and Chili. It forms the first part of his great work Philosophic des Rechts. The second part contains Die orga-nische Staatslehre (Vienna, 1850) and Die ju-ristische Encyhlopadie (1855-'7).