C LE VE R HANS 



(THE HORSE OF MR. VON OSTEN) 



A CONTRIBUTION TO EXPERIMENTAL 



ANIMAL AND HUMAN 



PSrCHOLOGT 



BY 



OSKAR PFUNGST 



WITH AN INTRODUCTION BY PROF. C. STUMPF, 

 AND ONE ILLUSTRATION AND FIFTEEN FIGURES 



TRANSLATED FROM THE GERMAN 

 BY 



CARL L. RAHN 



Fellow in Psycholosy in the University of Chicago 



WITH A PREFATORY NOTE BY 



JAMES R. ANGELL 



Professor of Psychology in the University of Chicago 



NEW YORK 



HENRY HOLT AND COMPANY 



1911 



