10 'Journal of Comparative Neurology and Psychology. 



Each day M was put into the box alone for ten minutes before 

 X was put in with her. After X had turned the button and eaten 

 the meat she was taken out and M was left alone in the box for 

 five minutes. She got no meat unless she turned the button. 

 Occasionally she smelled of the button but she made no effort to 

 turn it until the end of the fifteenth trial. 



Experiment 5. Raising Small Trap-door. 



Method. — A door (7x9 cm.) was made in the bottom of Box II. 

 A narrow opening was left in the front end of the door. By insert- 

 ing the claws in this opening the cat could easily raise the door 

 and get the meat placed under it. The doorway was closed on 

 the under side so that the cat could not get out of the box. 



Results. — X learned unaided to open the door in less than twenty 

 minutes and Z learned almost as soon. Y was left in the box alone: 



Nov. 26 20' 



Nov. 27 25' 



Nov. 28 20' 



Nov. 30 90' 



Dec. 1 30' 



Although he worked at the door more or less, he did not once 

 succeed in getting it open, as he almost invariably scratched in 

 the wrong place. 



TABLE VIII. 

 T imitating X and Z. 



