Haggerty, Imitation in Monkeys. 355 



covers both the time the imitatce was performing and the time the 

 imitator remained in the cage after the removal of the imitatee. To 

 indicate the act of the imitatee in getting food, I have nsed the 

 word performance. Successive performances arc indicated by P. 2, 

 P. 3, etc. 



IV. ExPEKi:ME]srTS and EESui/rs. 

 1. Chute Experiment A. 



A. Description of Device. 



In the top of the okl cage (fig. 1), near the wire front and the wire end 

 was a door, 0, 10 cm. square, which opened inward and was lield shut by a 

 device, h, on the top of the cage. At a point in the top near the lioard end and 

 the hack, a hollow chute, c, 5 cm. square, projected perpendicularly into the 

 cage 60 cm. From the device which held the door shut, a string, d, passed 

 to the top of the chute and hung down on the inside to within 10 cm. of the 

 bottom of It. To the end of the string was fastened a bit of iron, e, to serve 

 as a hand hold. The top of the chute was covered with a cap, /, so that 

 no light could come through it. 



In order to secure the food, the monkey must leap from the wire part 

 of the cage to the chute, and, while holding to it, must thrust a hand up 

 inside and pull the string, thereby releasing the small door in the top of the 

 cage and allowing food which had been placed on it to fall to the floor. 

 He must then descend to the floor to get the food. 



B. Behavior of l\o. 2. 



Preliminary trials. — First trial, Jan. 4. No. 2 first picked up crumbs 

 of food from the floor of the cage. He then played about on the floor and 

 tlie wire end and front of the cage. He jumped from the front of the cage to 

 the chute and back to the front. This he repeated five times. He took no 

 notice of the end of the chute. Time : 30 minutes. 



Second trial. Jan. 6. The behavior of No. 2 was similar to what it was on 

 Jan. 4. He seemed quite anxious to escape. He jumped to the chute three 

 times. The third jump so shook the chute that the door was jarred open and 

 the food (peanuts) fell to the floor. No. 2 noticed the food immediately and 

 climbed down to eat it. When the nuts had been eaten, he climbed the front 

 of the cage, and, holding with his . feet to the wire, reached the swinging 

 door with his hands and thrust his head up through the open door. 



Third trial, Jan. 7. No. 2 was quite shy. He ate crumbs from the floor 

 and climbed the wire parts of the cage. During the thirty minutes he 

 jumped to the chute twenty-two times. 



Fourth trial, Jan. 8. No. 2 jumped to the chute repeatedly and on the 

 seventh jump he threw his head and shoulders downwards. While hanging by 

 his tail and feet, he looked up the chute, thrust up his liand and pulled 

 the string. The food fell. Twenty times more he jumped to the chute, but 

 did not get food. 



