Behavior Monographs 



Volume 3. Number 1. 1916 Serial Number 12 



Edited by JOHN B. WATSON 



The Johns Hopkins Univeraily 



The Mental Life of Monkeys and Apes; 

 A Study of Ideational Behavior 



ROBERT M. YERKES 



Published 



at Cambridge, Boston, Mass. 



HENRY HOLT & COMPANY 



34 West 33d Street, New York 



G. E. STECHERT & CO., London, Paris and Leipzif, Foreisn A^en 



