348 journal of Comparative Neurology and Psychology. 



After having followed No. 2 out nine times No. 3 made his first 

 attempt to get hold of the knot with his teeth, and then ran directly 

 to the door. This was the only time that he tried to seize the 

 knot when alone in the box. Three or four times he pulled the 

 knot after No. 2 had opened the door before he followed him out. 

 Frequently he would stand beside No. 2 and try to get hold of the 

 knot when No. 2 was reaching for it. After he had followed No. 2 

 out about ten times he became much less active when put back by 

 himself, but was all attention and activity as soon as No. 2 was put 

 in with him. He would then run back and forth from No. 2 to 

 the door until No. 2 opened it, when he would not infrequently 

 beat him out. 



Once I put in No. 4 with No. 3 to see what No. 3 would do. 

 He followed No. 4 all around the box for a little while, but as No. 

 4 did not get out he soon gave up following him closely. 



NO. 4 IMITATING NO. z. 



No. 4 



Time 



Totals 24 24 24 



No. 4's single success in getting out was due to the fact that the 

 knot hung low enough for him to reach it with his teeth. I raised 

 the knot so he could not get it except by using his forepaws. 



Out of the twenty-four times that No. 2 pulled the knot. No. 4 

 stood up beside him twenty-one times. Twice No. 4 tried to get hold 

 of the knot as No. 2 was reaching for it. Thirteen times No. 4 

 stayed behind long enough to pull the string before following 

 No. 2 out. 



Of the twenty-four times that No. 4 spent five minutes in the box 

 by himself after having followed No. 2 out, he tried eleven times 

 to get hold of the knot, sometimes making several attempts dur- 

 ing the five minutes. The interesting point to be noted is that the 

 first two or three times he was put into the box alone he paid no 



