Samuel George Morton, an American physician, born in Philadelphia, Jan. 26, 1799, died there, May 15, 1851. He studied medicine, and graduated at the university of Pennsylvania in 1820. In the same year he entered the university of Edinburgh, where he graduated in 1823. In 1824 he settled in Philadelphia as a physician. He was recording secretary of the Philadelphia academy of natural sciences in 1825, and president in 1840. In 1834 he went to the West Indies, where he studied the diversity of races and the relations resulting from their contact. In September, 1839, he was elected professor of anatomy in the Pennsylvania medical college, which post he resigned in 1843. His collection of skulls, which was the largest museum of comparative craniology in existence, contained about 1,500 specimens, nearly 900 of which were human, obtained from widely separated regions of the earth. It now belongs to the Philadelphia academy of natural sciences. The result of his investigations, as bearing specially on the American aborigines or Indians, is embodied in " Crania Americana, or a Comparative View of the Skulls of various Aboriginal Nations of North and South America; to which is. prefixed an Essay on the Varieties of the Human Species," with 78 plates and a map (folio, Philadelphia and London, 1839). His " Crania Aegyptiaca, or Observations on Egyptian Ethnography, derived from History and the Monuments," with numerous plates and illustrations (4to, 1844), was based principally on a collection of 98 heads obtained by G. R. Gliddon from the tombs and catacombs of Egypt. He also published "Observations on the Ethnology and Archaeology of the American Aborigines " (Silliman's "Journal,"vol. ii., 2d series, 1846); an "Essay on Hybridity in Plants and Animals, considered in reference to the question of the Unity of the Human Species" (ib., vol. iii., 1847); and "An illustrated System of Human Anatomy, Special, General, and Microscopic" (1849).