Berry, Imitation in Cats. 



with Z for fifteen minutes. Neither got out although X did turn 

 the button. Nov. 12, Y got out in less than five minutes, but 

 when put back he did not get out again in fi3rty-five minutes. 

 Although X was now put in with him they did not succeed in get- 

 ting out. Nov. 13, Y was in the box alone for thirty minutes and 

 in with Z for ten minutes, but neither got out. On Nov. 14, Y, 

 although left in the box alone for thirty minutes, did not even 

 touch the button. After X and Z were put in with him they got 

 out: 



1st time in 5' 

 2d time in ic/ 

 3d time in 3' 



4th tiaie in i' 

 5th time in i' 

 6th time in i' 



The first time Z turned and closed the button; then X turned 

 the button and Z pulled the loop. The second time Z turned the 



BOX II. 

 Fig. 2. 



button and both X and Z pulled the loop. The third time Z 

 turned the button and X pulled the loop. The last three times 

 Z both turned the button and pulled the loop. In all these trials 

 Y merely looked on. Z was taken out and X and Y were left in 

 the box together for fifteen minutes, but they made no efforts to 

 get out. Nov. 15, Y saw Z open the door four times. Each 

 time Z opened the door both were fed, then Y was put into the 

 box alone for five minutes. During these four trials Y touched 

 the button but once, but after Z had turned the button the fifth 

 time Y jumped up and pulled the loop, thus opening the door. 



