JOHN B. WATSON AND MARY I. WATSON 



ment. Red was the positive color. Food was given with red 

 but denied with green. No punishment was introduced. The 

 animals. were fed for several days in the food box before the 

 stimulus lights were admitted. 



Training experiments upon the rat and the rabbit began 

 January 27th. Nineteen days from the beginning of training 

 the animals reached a high percentage of accuracy and there- 

 after never made more than one or two errors in a normal series. 

 The number of trials per day was 15. Experiments were made 

 daily without interruption for 39 days. 



Considered ready for control series. 

 Total number of trials, 555. 



Considered ready for control series. 

 Total number of trials, 555. 



