CHAMBERLIN, THOMAS CHROWDER American educator and geologist, was born at Mattoon, Ill., on Sept. 25, 1843. He graduated at Beloit college in 1866 (A.B.) and returned to the college in 1873 as professor of geology, serving also as assistant State geologist of Wisconsin until 1876, when he was made chief geologist of the Wisconsin Geological Survey (1876-82). From 1882 to 1887 he served as U.S. geologist in charge of the glacial division; from 1887 to 1892, as president of the University of Wisconsin; from 1892 to 1919, as head of the geological department of the University of Chicago, retiring as professor emeritus in 1919. He studied glaciers in Switzerland in 1878 and in Greenland in 1894, as geologist to the Peary relief expedition. His principal scientific work in later years has been the study of fundamental problems in geology particularly as re lated to the origin and growth of the earth, the developing of the planetesimal hypothesis of the planets, planetoids and satellites; and the chondrulitic hypothesis of the origin of chondrulites, comets and meteorites. He died in Chicago, Nov. 15, 1928.