Haggerty, Imitation in Monkeys. 41 1 



To opeu the door the auiiual must climb the wire and pull out this plug 

 (fig. 8). It could then get the food at the door (fig. 9). Conditions were 

 such that when the monkey was looking at the door, his back was toward the 

 plug, and that when he was working at the plug he could not see the door. 



B. Behavior of No. 5. 



Prclimiiianj trials — First trial. No. 5 went at once to the plug and tried to 

 bite it. She came down to the door and tried to get food. She went back at 

 once to the plug and bit and pounded it. She pulled on it, but in such a man- 

 ner that it bound on the edge of the opening and did uol come out. She then 

 went to the door again and looked at the food. A moment later she went to 

 the plug and grabbed it in both hands. Then she went to door and struck at 

 it with both hands in a characteristic manner. She tried to reach the string 

 on the outside of the post. Failing in this she went back to the door. She 

 went to the plug and pounded it with her nails. Then she jumped to the 

 screw eye in the top of the cage where the rope had hung in the Rope 

 Experiment. She held by the fingers of one hand and thrust the other arm 

 through a hole (feeder hole) in the top of the cage. She then came down 

 to the floor. 



Second trial. On the second day No. 5 was still eager to solve the new 

 problem, the slide door and the plug. She first climbed to the plug and 

 chewed the end of it. Later slie descended from the wire and after walking 

 around on the floor went to the door and tapped on it with her nails. She 

 then climbed to the plug and later went to the door. Then she went to the 

 plug and chewed off some splinters. She tried to move it with her hands. 

 Then she went back to the door, tapped it with her nails and later pushed it 

 vigorously'. 



Third trial. On the third day No. 5 went to the door at once. A moment 

 later she went to the plug. She pulled, bit and pounded it with lier nails. 

 She rushed down to the food door to get the food and worked at the door 

 continuously for six minutes. She had several movements which she used 

 repeatedly. She balanced on her feet in the middle of the cage, her body 

 lifted slightly from the floor and almost erect ; then she lunged at the door, 

 striking it with both hands. Her aim was not direct enough to land on the 

 glass, usually striking the edge of the opening. She sometimes jumped with 

 such force as to throw her body back into the cage. 



Another movement was to grasp the lower edge of the opening with both 

 hands and shake it hard. She found a piece of paper on the floor and put 

 it against the glass and pouuded it and pushed on it. Then she tapped with 

 iier nails on the glass. Later she climbed the side of the cage near the 

 door and supporting herself with her hands, she put her feet against the door 

 and pushed. The next move was to force paper into the edges of the opening. 

 Once, after vigorous effort, she ran up the post to the plug and pulled, bit 

 and pounded it. The pull was always sideways, never straight out. This 

 vigorous activity continued for twelve minutes. At the last she picked up 

 some refuse, laid it upon the edge of the opening, and went away. 



