CATTELL (JAMES) McKEEN, an American psychologist, born in Easton, Pa., May 25, 1860, graduated at Lafayette College in 1880, and studied at Leipsic, Paris, Geneva and Göttingen. He was assistant under Wundt at the University of Leipsic, Professor of Psychology in the University of Pennsylvania in 1888-1891, and Professor of Experimental Psychology in Columbia University from 1891 to 1917. He was co-editor of the “Psychological Review,” “Science,” etc., and a member of many scientific associations.