BROOKS, WILLIAM KEITH American zoologist, was born in Cleveland, 0., on March 25, 1848. He graduated at Williams college in 1870 and later studied with Louis Agassiz (q.v.) at Harvard University (Ph.D., 1875). In 1876 he was made associate in Natural history at Johns Hopkins univer sity, where he became professor of animal morphology in 1891, head of the biological laboratory in 1893 and also professor of zoology. He established a marine laboratory and made extensive and valuable researches on the morphology of various groups of marine animals, especially the tunicates, crustaceans and the oyster. As one of the ablest of American investigators, he exer cised marked influence upon the biological thought and teaching of his time. Among his more important works are Provisional Hypothesis of Pangenesis (1877), Heredity (1883), Monograph of the Genus Salpa (1893), Foundations of Zoology (1899-1907) and a popular book on The Oyster (1891). He died at Baltimore, Md., on Nov. 12, 1908.