SILLIMAN, Justus Mitchell, mining engineer, born in New Canaan, Connecticut, 25 January, 1842. He studied at New Canaan academy, enlisted at the beginning of the civil war, and served for three years, being wounded at Gettysburg. At the close of the war he settled in Troy, New York, where he taught in an academy, and was graduated at Rensselaer polytechnic institute in 1870 with the degree of M. E. In September of that year he was called to the charge of the department of mining engineering and graphics in Lafayette college, which place he still (1888) holds. Professor Silliman has invented an instrument for orthographic, clinographic, and crystallographic projection, also a water manometer and anemometer. He is a fellow of the American association for the advancement of science and a member of the American institute of mining engineers, and has been president of the Lehigh valley microscopical society. His special work has included various investigations, of which his examination of the Bessemer flame with colored glasses and the spectroscope is the best known. Professor Silliman's writings have been confined to professional papers that have been published in the transactions of societies of which he is a member.