DE MORGAN, A.VGLISTIIS, was b. in 1806, in the small Indian island of Madura, on the n.e. coast of Java. His father was au officer in the British army. He was educated at Trinity college, Cambridge, and took his degree of B.A. in 1827, when he was fourth wrangler. He was appointed first professor of mathematics in the University college, London, after its foundation in 1828. In 1831, he resigned this office, but was reap pointed in 1836, and continued in that capacity till his death. His writings are very numerous. Besides being a mathematician of the first order, he was extensively and minutely versed in the history of the mathematical and physical sciences. He also devoted himself to the development of the Aristotelian or " formal" logic, to which he has given so symbolical a shape as to make it seem like a branch of algebra. lie has written likewise on the calculation of insurances and on the decimal coinage. The fol
lowing are the titles of a few of his works: Elements of Arithmetic (1830); Elements of Algebra, preliminary to the Differential Calculus (1835); Elements of Trigonometry and Trigonometrical Analysis, preliminary to the Calculus (1837); Essay on Proba bilities, and on their Application to Life Contingencies and Insurance Offices (1838); Formal Logic, or the Calculus of Inference necessary and probable (1847); Arithmetical Books, from the Invention of Printing to the Present Time, being brief notices of a large number of works drawn up from actual inspection (1847). De M. is also the author of the treatises on the differential and integral calculus, published by the society for the diffusion of useful knowledge; and contributed largely to the Penny Oyclopadia. He died Mar., 1871.