Haggerty, Imitation in Monkeys. 417 



II. 

 Cases of imitation when tlie imitator was confined during tlae activity of 



the imitatee 



Cases of imitation when the two animals were together in the cage 2 



III. 



Cases of immediate imitation 



Cases of gradual imitation 2 



IV. 



Cases of imitation in which the imitating animal did not himself experience 

 the result of the act before performing it 1 



Cases of imitation in which the imitating animal did experience the result 

 of the act before performing it 1 



7. Button Experiment. 



A. Description of Device. 

 In this test the slide door (fig. S, a) used in the Plug Experiment was 

 the place where the animal could get food. It could be opened by a button 

 (fig. 10, h) in board Z), which must be pushed to the right. This button was 

 S cm. broad at the largest breadth of its pear shape and 14 cm. long. Its 

 lower edge was 22 cu). from the floor. A string, c, fastened to the back 

 part of the button passed through a hole, 5 cm. in diameter, in board D, 

 and along the outside of the cage to the slide door. The button was fastened 

 to Board D at the top by a small bolt. A small knob fastened to the middle 

 of the button enabled the animal to grasp it easily. A screw eye in the 

 board prevented the button from being pushed to the left. The animal 

 could get food by pushing the button to the right and then passing to the 

 slide door in board A which had been opened by the movement of the button. 



B. Bella rior of No. 3. 



Preliminary trials.— F\vs,i trial. No. 3 worked at the door, biting tlie edges 

 for ten minutes. He then Avalked to the button, gave one bite at it, and 

 came back to the door. Later he repeated this, biting the knob on the button. 

 He climbed the cage a number of times and then sat in the corner of the 

 cage near the food door. 



Second trial. On the second day No. 3 went to the door and bit at the 

 edge, but not so vigorously on account of nails that had been driven into the 

 edges of the opening to protect it. He went twice to the button and bit the 

 edges. Then he ran about the cage, and finally rested in the corner near the 

 food door. 



Third trial. The third day No. 3 again worked at the food door, biting the 

 edges. Then he went to the button, bit at it and came back to the door. He 

 repeated this behavior four times in three minutes. 



