430 'Journal of Comparative Neurology and Psychology. 



food lie did not climb the cage as before, but kept near L. Oiilj' once did 

 he go up, and then to chase No. 5. 



P. 3. While No. 1.3 was at the brace after chasing No. 5 down No. 5 pulled 

 the string. No. 13 saw this and after a moment he went to L and got the 

 food. From this on he came to the floor whenever he saw No. 5 near L. 

 In her turn No. 5 assumed a threatening attitude toward No. 13. 



P. 4. No. 13 saw perfectly from the brace and came slowly down and got 

 the food. No. 5 was not inclined to eat the seeds, having an appetite only 

 for grapes. 



P. 5. No. 13 saw while on the floor. No. 5 got the grapes and No. 13 got 

 the seeds. 



P. 6. No. 5 pulled the string while No. 13 was climbing the wire. He 

 jumped to the floor and rushed to L; No. 5 fled up the wire. 



P. 7. No. 5 pulled the string when No. 13 was eighteen inches away. He 

 rushed to L and got the grape. A moment later when No. 5 went near the 

 opening, No. 13 pushed to the place and kept such a close watch that for 

 some time No. 5 could not get near 21c. 



P. S to P. 10. No. 13 saw from X and drove No. 5 away before she could 

 get the food. 



P. 11. No. 5 got the grape and No. 13 got the seeds and went up to X to eat 

 them. 



No. 5 was now removed. No. 13 finished eating the seeds he had gotten 

 and then went to the floor, to L. and back up to X. He spent almost the 

 entire ten minutes at A'. Near the end of the time he went to L and examined 

 it carefully. Then he looked up at knobs 21c and Sk, put his hand on 2k, 

 took it off, and looked back at L. He then climbed to A, returned to L, and 

 went back to A. 



Sixth test. No. 13 and No. 5 were put into the cage together again. No. 

 5 was afraid of No. 13 and kept away from him. 



Performance 1. No. 5 pulled the string and got the food. No. 13 saw from 

 tlie wire near the toy) of the end of the cage. Coming quickly to the floor, 

 he searched L vigorously. 



P. 2. No. 5 pulled the string. No. 13 saw plainly and went to L. He tried 

 to get food, but No. 5 had taken it. 



P. 3. No. 13 saw while on the floor near L, and going to the place searched 

 a long time for food. Twice he put his hand on 2k. 



P. 4. No. 13 kept near No. 5 at L, and when she pulled the string she had 

 to reach her arm over the head of No. 13. His whole attention was on her 

 movements and he saw perfectly. 



P. 5. No. 13 was beside No. 5 at L and saw perfectly. He got the grape 

 and frightened No. ,5 away. 



P. 6. No. 13 saw perfectly, got the food and sat by L. so No. 5 did not 

 return. Once he put his left hand on 2k and straightened out his arm as 

 if to pull, but he did not exert much force on the string. Immediately he 

 thrust his other hand into L. Again he took 2k in his left hand, straight- 

 ened his arm as before, immediately afterward thrusting his right hand 



