380 'Journal of Comparative Neurology and Psychology. 



both liauds as if to climb, but although he looked up, he did not lift him- 

 self from the floor. He tried to climb the post again as before, but when 

 he failed he did not turn to the rope at once; he did, however, a moment 

 later. During the last fiA'e minutes of the fifteen he remained in the cage 

 after No. 3 was out, he sat in the corner near the rope, part of the time 

 holding it in his hands. 



Third test. No. 2 was more or less distracted by other monkeys in the 

 room and not being very hungry did not observe No. 3 closely. He saw 

 the whole act five times in twelve. He did not watch from first to last. 

 It was counted if he saw No. 3 climb the rope and also get the food, 

 even though his attention was not continuous. In no case, however, did 

 No. 2 watch No. 3 continuously from the time he left the floor until he 

 got the food. No. 2 saw by glances only. Three times he swung out from 

 the wire front and twice he tried to climb the post as in the previous test. 



When No. 8 was taken out No. 2 ran about the cage. He grasped the 

 end of the rope when on the floor. He looked up at the door and tried to 

 climb the post. Then he grasped the rope with one hand above the other 

 as if to climb. Dropping the rope he turned to the post, then back to the 

 rope, grasping it in his hands and bearing part of his weight on it. It 

 swung and he took a few steps. Again he grasped the rope and bit the 

 end of it. Then he grasped it with two hands and one foot. Then he 

 turned to the post and put his hands and one foot on it. Then on the 

 other foot he turned as on a pivot and grasped the rope with the three 

 members he had placed on the post. Then he ran to the front of the cage 

 and back to the rope, grasping it again with two hands and one foot and 

 bearing some weight on it, but not enough to lift the other foot from the 

 ground. Then he grasped the rope in his hands and rushed to the wire 

 to climb. This he repeated, wholly or in part, several times more in the 

 next two minutes. He was then taken out twenty minutes after No. 3 

 had been removed. 



Fourth test. When No. 2 and No. 3 came into the cage together No. 2 

 was very attentive to everything No. 3 did and looked often toward the 

 food door. When No. 3 climbed the rope. No. 2 climbed the wire front of 

 the cage on the first and second trials. When No. 3 pushed against the 

 door with his hands his feet pushed the rope over toward No. 2, who was 

 on the wire front of the cage. No. 2 was eager to grasp the rope and 

 once did grasp it in his hands, but would not let go of the wire with his 

 feet. When No. 3 got the food the rope swung back to a perpendicular 

 position, and No. 2, holding with feet and tail to the wire, threw his 

 body out toward the rope. He repeated this motion several times, and 

 when No. 3 got food the third time No. 2 was able to grab it out of his 

 hands. This he did on the fourth and fifth trials also. No. 3 was then 

 removed and No. 2 became very active on the wire, throwing his body 

 vigorously toward the rope, and failing to grasp it, he repeated the act 

 at once. His motions increased and he seemed frantic to catch the rope. 

 Finally he jumped, catching the rope and liolding. At once he jumped 

 back to the wire, and ran down to the floor ; he quickly climbed the rope 



