Watson, Color Vision in Monkeys. 



23 



TABLE I. 

 J's Reactions to Red-Green. 

 A — With Stimulus Constant. 



B — With Stimulus Variable. 



*E designates subjective quality. 



The above tests were continued from April 27th to May 28th. An average of from 85-90 per cent 

 of correct choices was maintained throughout the whole period. In these last tests, all variations in 

 the presentation of the stimuli which could be thought of were introduced, such as presenting the 

 red on the right and left alternately, red twice on right, once on left, then three times on right and 

 three on left, etc. On account of the position error eiftering into B's reactions, he was fully one 

 month behind J. Since it was desirable to keep J in practice, he was put through all the control 

 tests with B. 



