Behavior Monographs 



Volume 3, Number I, 1916 Serial Number 12 



Edited by JOHN B. WATSON 



The Johns Hopkins University 



The Mental Life of Monkeys and Apes: 

 A Study of Ideational Behavior 



ROBERT M. YERKES 



Harvard University 



WITH SIX PLATES AND FIVE TEXT FIGURES 



Published 



at Cambridge, Boston, Mass. 



HENRY HOLT & COMPANY 



34 West 33d Street, New York 



G. E STECHERT & CO., London, Paris and Leipzig, Foreisn Ajents 



