342 journal of Comparative Neurology and Psychology. 

 Experiment IV. Modified. 



I now modified the experiment by changing the top of the cage 

 in such a way that the door was no longer near the middle but to 

 one side of the top, and the food instead of being placed near the 

 door, as before, was removed as far from it as the size of the cage 

 would permit. The purpose of the change was to discover how 

 the rats would proceed to find the door in its new position. The 

 following table shows the time it took the different rats to get out. 



No. I 6' 



No. 6 3' 



No. 8 s' 



No. 2 3' 



No. 5 i' 



No. 3 15' 



No. 4 24' 



For some of the rats the center of attraction was the place where 

 the door had been, and from that point they gradually worked 

 outward until they found the door. Other rats started from the 

 place where the dish containing the food was and gradually radi- 

 ated out from that place until they found the door. When the rats 

 found that the door was not in its former position they proceeded 

 to examine the top of the cage until they found it. 



If reference is made to p. 339, it will be Seen that No. 7 did not get 

 out of the cage, although he saw No. 6 pass out twenty-five times. 

 When first put in, after the position of the door had been changed, 

 he showed no preference for any particular part of the top of the 

 cage. After ten minutes he gave up trying to get out. I then put 

 into .the cage a small piece of wood attached to a string and drew 

 the piece of wood through the door fifteen times in about twelve 

 minutes. The first few times No. 7 smelled of it and watched it 

 go through the door. Once or twice he smelled of the door, but 

 most of the time he paid no attention to the piece of wood. Not 

 once did he attempt to follow it through the door. He was next 

 given an opportunity of getting out by watching No. 6 and No. 8. 



No. 7 was given five minutes in the cage by himself each time 

 after No. 6 or No. 8 got out. The interesting feature was the 

 way that he followed No. 6 or No. 8. In each case he tried to get 

 through the door before it fell, but was a little too late until the 

 seventh trial. 



