386 Journal of Comparative Neurology and Psychology. 



P. 4. At once No. 2 jumped to the rope from the front of the cage, but 

 came to the floor without opening the door. He then walked about on 

 the floor for several minutes. Then he climbed the rope, gave one push 

 on the door, but failed to open it. He soon climbed again, opened the door 

 and got food. No. 6 saw him with the food and threatened him ; No. 2 

 shrieked ; No. 6 folded his arms ; No. 2 lay down on the floor. No. 6 

 jumped up and down ; No. 2 came near the box, and seemed to have no fear. 



P. 5. No. 2 climbed the rope, opened the door and got food. No. 6 saw all. 



P. 6 to P. 8. No. 2 did as in P. 4. No. 6^ saw No. 2 on the rope and at 

 the door, but did not see him open the door. 



No. 2 then sat on the floor quietly for several minutes. 



P. 9. No. 2 climbed the rope and opened 'the door, but did not get the 

 food which had dropped off the belt. The food was replaced and No. 2 got 

 it. No. 6 saw all but the opening of the door. 



No. 2 was now removed and No. 6 was released in the cage. At once 

 he climbed the rope, put liis hand against the door, but failed to open it. 

 jrie then swung down, hanging by his tail to the rope, and dropped to the 

 floor. He then climbed the rope and examined a hole in the top of the 

 cage. He came to the floor again. Again he climbed the rope and examined 

 all about the door ; pushed on the door, but did not open it ; he bit at the 

 edge of the door and again pushed on it, opening it. He got the food and 

 descended the rope, immediately afterward climbing the wire. 



When the device was reset No. 6 climbed the rope and examined the door 

 with his teeth and fingers ; he worked at the edge with his fingers. He then 

 jumped to the wire and in so doing put his foot against the door pushing it 

 slightly; he leaped back at once and pushed the door open with his hand, get- 

 ting the food. 



When the device was reset No. 6 tried to open the door with his fingers 

 and after one effort leaped to the wire. Leaping back he tried to bite the edge 

 of the door and then by a vigorous push with his hand forced it open and 

 got food. The device was reset and No. 6 climbed the rope at once. Placing 

 his palm flat against the door he opened it with the flrst effort. He repeated 

 the act as soon as the device was ready to operate, and four times more 

 within a few minutes. 



In all No. 6 opened the door and got food nine times within sixteen minutes. 



Summary of Behavior of No. 6 in the Rope Experiment. 

 No. 6, like No. 4, was free on the rope from the first. He became indif- 

 ferent to it during the later trials and made no progress toward getting food. 

 When he was placed in the observation-box to watch No. 2 he was very attentive 

 to what No. 2 did and seemed quite excited by the conduct of the latter. He 

 saw the entire performance once and in part three times. When he was 

 released his behavior was markedly different from what it had been in the 

 preliminary trials. His attention was directed to the proper place to get 

 the food, and after a few random movements he succeeded in getting food 

 for himself in a manner similar to that which he had seen. 



