ABBOT, CHARLES GREELEY

(1872), son of Harris and Caroline Ann. Graduated at Ma achusetts Institute of Technology in 1894, M.S. in 1895. Given D.Sc. in 1914 by Melbourne University. A istant in Smithsonian Institute Astro-physical Observatory in 1895, director of same since March, 1907, Secretary Smithsonian since 1918. Also Secretary National Academy of Science. Engaged in original researches on the solar radiation. Conducted expeditions to observe total solar eclipses of May 29, 1900, May 18, 1901, January 3, 1908, and May 29, 1919. Studies of total amount and variability of solar radiation and the effect of its variability on climate. Draper medalist, Nat. Acad. of Science; Rumford medalist Amer, Acad. Arts and Sciences.