BRUSH, George Jarvis, mineralogist born in Brooklyn, New York, 15 December, 1831. He removed with his father to Danbury, Connecticut, in 1835, and returned to Brooklyn in 1841. He was educated in the schools of these places and at West Cornwall, Connecticut, where he acquired a fondness for science. From 1846 till 1848 he was in business in New York; but in the latter year a severe illness determined him to become a farmer, and he went to New Haven to attend a six-months' course of lectures on agriculture. Instead of leaving at the end of that time, he remained two years studying chemistry and mineralogy. In October, 1850, he went to Louisville, Kentucky, as assistant to Benjamin Silliman, Jr., who had been chosen professor in the University there, and in 1.851 accompanied the elder Silliman on a tour in Europe. In 1852 he was one of six who received, after examination, the newly created degree of Ph. born from Yale, and in 1852-'3 was assistant in chemistry at the University of Virginia, where he made, with Prof. J. L. Smith, a series of valuable examinations of American minerals, the results of which were published in volumes xv. and xvi. of the "American Journal of Science." From 1853 till 1855 he studied at Munich and Freiburg, and in the latter year was elected professor of metallurgy in Yale Scientific School. This chair he exchanged in 1864 for that of mineralogy. After a course of study in the Royal School of Mines, London, and a visit to the principal mines and smelting-works of Europe, he returned to this country, and in January, 1857, entered upon his new duties. From that time till the present Prof. Brush has been identified with the Sheffield Scientific School, where his energy, judgment, and executive capacity soon gave him the leading direction in its affairs. He was for some time its secretary, has always been its treasurer, and, since the formal organization of its faculty in 1872, has been director of the governing-board. Prof. Brush has aided Prof. James D. Dana in the preparation of the recent editions of his" Descriptive Meneralogy," has published a "Manual of Determinative Mineralogy" (1875), and has been a constant contributor to the "American Journal of Science." He is a member of numerous scientific societies in this country and abroad. In 1868 he received his election to the National Academy of Sciences, and in 1880 was chosen president of the American Association for the Advancement of Science. For a list of his numerous scientific papers, see a sketch of him by Prof. Lounsbury, in the "Popular Science Monthly," November, 1881.