46 TRAITS OF YOUNG CHIMPANZEES 



As it was ascertained in advance that Chim could by 

 springing reach an object approximately 100 cm. from the 

 floor, the banana in the first instances was placed 150 cm. 

 from the floor. 



In this test the initial use of a box to reach or spring from 

 came slowly. Chim exhausted all other possibilities of ap- 

 proaching the reward before finally attempting to move one 

 of the boxes. Having tried this experiment and discovered 

 that it worked he very naturally came to drag the boxes 

 about and place them to suit his purpose. Then came a 

 period of resourcelessness when the banana was placed at 

 such a height from the floor that it could not be obtained by 

 the use of any single box. Under these conditions Chim 

 wasted one full period (usually about thirty minutes) of 

 observation. 



The utilization of two or more boxes appeared suddenly 

 and without warning as described below. 



At 6.30 p.m. on August 27 and before the evening meal, 

 the box stacking test was arranged. Chim was in fine work- 

 ing condition. The string was baited with a large banana 

 placed about 150 cm. from the floor. The three boxes were 

 placed about the room at least 2 feet from a point directly 

 beneath the banana. 



Chim made no move to get the banana until I left the room. Then 

 he turned to his task directly and with extreme energy and evident 

 determination. 



First he sprang a few times from box 1 in its original position, but 

 it was too far away for him even to touch the banana. Promptly 

 abandoning this method he seized box 3 and moved it toward the center, 

 leaving it perhaps 12 inches oflf center. From this box, thus placed, he 

 jumped in rapid succession twenty or more times, working with utmost 

 persistency and energy. Stopping he turned suddenly toward the rear 

 side of the room and pulled a blanket from peg to floor. I supposed be 



