REES, John Krom, educator, born in New York city, 27 October, 1851. He was graduated at Columbia in 1872, and at the School of mines in 1875, and in 1873-'6 he was assistant in mathematics at the latter institution. In 1876 he was called to the professorship of mathematics and astronomy in Washington university, St. Louis, where he remained until 1881, when he was recalled to Columbia., given charge of the department of geodesy and practica1 astronomy, and made director of the observatory. While he was in St. Louis the system radiating from the Washington university observatory was established by his aid, and the observatory was built, in , July, 1878. he was a member of the Fort Worth solar eclipse party, and contributed a report to the publications of the expedition. Professor Rees is a member of scientific societies, and has been active in the American association for the advancement of science, having been local secretary at the St. Louis meeting in 1878, secretary of the section on mathematics and physics in 1879, and general secretary in 1880. He has held various offices also in the American metrological society since 1883. He has been chairman of the board of editors of the "School of Mines Quarterly" since 1884, and has published "Report on the Total Solar Eclipse, July, 1878," " Observations of the Transit of Venus, 6 December, 1882," and, in addition to various papers and lectures before the New York academy of sciences, has written cyclopaedia, articles.