Volume I 
SEPTEMBER, 1922 
Serial No. 2 
Comparative Psychology 
Monographs 
Edited by 
WALTER S. HUNTER 
The University of Kansas 
with the co-operation of 
H. A. CARR. 
The University of Chicago 
S. J. HOLMES. 
The University of California 
K. S. LASHLEY, 
The University of Minnesota 
R. M. YERKES. 
The National Research Council 
) 
A BEHAVIORISTIC STUDY OF THE 
ACTIVITY OF THE RAT 
BY 
CURT P. RICHTER 
Psychological Laboratory, Phipps Psychiatric Clinic 
The Johns Hopkins Hospital 
kz jv * 
• : 
Published Irregularly 
WILLIAMS & WILKINS COMPANY 
Mount Royal and Guilford Avenues 
Baltimore, U. S. A. 
