ROCKWOOD, Charles Greene, mathematician, born in New York city, 11 January, 1843. He was graduated at Yale in 1864, where in 1866 he received the degree of Ph.D. in course for advanced scientific studies. In 1868 he was called to the professorship of mathematics and natural philosophy at Bowdoin, and in 1873 he accepted that of mathematics and astronomy at Rutgers, whence in 1877 he passed to the chair of mathematics in Princeton, which he now (1888) holds. Professor Rockwood was a member of the Princeton eclipse expedition that was sent to Colorado in 1878, is a fellow of the American association for the advancement of science, and a member of the American metrological society, of which he was the first secretary, he has acquired considerable reputation by his studies of American earthquakes, on which subject he has contributed papers to the "American Journal of Science" since 1872. The annual summaries of progress in volcanology and seismology in the reports of the Smithsonian institution for 1884-'6 were his.