The Journal of 



Comparative Neurology and Psychology 



Volume XIX April, 1909 Number i 



SOME EXPEKIMENTS BEARING UPON COLOR VISION 



IN MONKEYS. 



JOHN B. WATSON. 

 , From the Psychological Lahoratory of the University of Chicago. 



With Five Figures. 



For o-^^er a year, the writer has been experimenting with apparatus 

 for obtaining large bands of spectral light suitable for use as stimuli 

 in testing the color vision of animals by means of the discrimination 

 method. In the process of constructing the apparatus finally adopted, 

 the writer has availed himself liberally of the assistance of Pro- 

 fessors Gale and Milliken of the physics department of the Uni- 

 versity of Chicago, and of Professor R. W. Wood of the physics 

 department of the Johns Hopkins University. He is also under deep 

 obligation to Professors Angell and Carr for many valuable sug- 

 gestions. 



The actual accumulation of the data bearing upon color vision 

 in monkeys began March 12th and ended August 20, 1908. Two 

 rhesns monkeys (J. and B.) and one cebus (H.), all gentle and 

 accustomed to experimentation, were the subjects used in the investi- 

 gation. The report is given in its present incomplete form, because 

 of the fact that the writer's work could not be continued at the 

 University of Chicago. The apparatus used there, however, has 

 been duplicated in the Hopkins laboratory and the investigation 

 will be continued in the latter place both upon two of the monkeys, 



The Journal op Comparative Neurology and Psychology. — Vol. XIX, No. 1. 



