Haggerty, Imitation m Monkeys. 



413 



door was not closed. No. 2 sat by aud watdied all the time. He saw the 

 entire performance ten times. 



When No. 5 was out No. 2 went to the door and fingered about it for 

 three or four minutes. He then sat down and whined ; he made no further 

 effort to get the food. He did not notice the plug. 



Fourth test. No. 2 and No. 5 were very friendly, No. 2 "picking fleas" 

 from No. 5 when slie was busy getting food. No. 5 was very eager to get 

 food aud rushed from the door to the plug. No. 2 was fairly attentive and 

 saw No. 5 pull the string many times when she got no food. He saw her 

 get the food ten times. 



When No. 5 was out No. 2 worked at the door for some time. Then he 

 climbed the post and pulled at the plug with his hands as No. 5 had done. 

 He did not pull it out nor did he persist in pulling. Later he pulled the 

 plug out, but did not see that it had opened the door. It was reset. Several 

 minutes later he came to the plug, pulled it out, saw the door open, and got 

 the food. When the door was reset he worked at it for three minutes, then 

 climbed the cage wire and looked about. He was above the plug; he looked 

 down, saw it, climbed down to it, pulled it out, saw the door open and got 

 food. He pulled the plug again before it was reset. When it was reset he 

 worked at the door for a minute, then climbed the cage, looked about and 

 came back to the door. Then he ran up the plug, pulled it, aud got food. 

 He pulled it three times more before it could be reset. He repeated this 

 four times in three minutes, getting food each time. 



Three days later No. 2 pulled the plug twelve times within a few minutes, 

 getting food each time. 



TABLE 25. 



No. 2 Imitating No. 5. 



Suniiiifirij of Behavior of Xo. 2 in the I'huj E-riwriiucut. 



The Plug Experiment set a different problem from any of tlie experiments 

 already described. The food was obtained at one place, but the door could 

 be opened only by working at a place removed from the door. 



No. 2 made no progress toward a solution of the problem during his pre- 

 liminary trials. The first three tests did not aid him. In the fourth test 

 No. 5 made more rapid trips between the door and the plug. She seemed 



