YOUMANS, William Jay, American chemist, brother of E. L. Youmans (q.v.): b. Milton, Saratoga County, N. Y., 14 Oct. 1838; d. Mount Vernon, N. Y., 10 April 1901. He studied chemistry at Columbia College and at the Sheffield Scientific School, New Haven, and was graduated from the medical department of the New York University in 1863 and practised his profession for a time at Winona, Minn. In 1871 he was called to assist his brother, who had planned to publish The Popular Science Monthly, and from that time till 1900 was actively connected with the management and editorship of that periodical. He edited ‘Pioneers of Science in America’ (1895); Huxley's ‘Lessons in Elementary Physiology,’ adding a second part, ‘Elementary Hygiene’ (1867) and was author of ‘Pioneers of Science in America’ (1895).