412 Journal of Comparative Neurology and Psychology. 



Fourth trial. Ou the fourth day No. 5 begau to shake the door vigorously. 

 She then rushed up to the plug and bit and pulled it. She worked at the 

 slide door intermittently during the remainder of the time. 



Fifth trial. The fifth day No. 5 went to the door and worked at the edge. 

 She then climbed to the plug and bit and pulled. Then she ran down to the 

 slide door. She returned to the door repeatedly. She worked persistently 

 and vigorously at it, jumping at it and pounding it. 



When No. 5 had failed in her five attempts the plug was pulled partly out of 

 the hole. She was then able to pull it entirely out. She got the coimectiou 

 with the door at once and after a few times worked the device perfectly. 

 She was then used to perform the act for others in the imitation tests. 



C. Behavior of A'o. 2. 



Preliminary trials. — First trial. No. 2 went to the door at once and looked 

 at the food. He went soon again. He then spent the rest of the time about 

 the cage in the usual manner. 



Second trial. On the second day No. 2 climbed to the plug and bit it. 

 He went to the floor and to the slide door. Later he bit the plug a number 

 of times, but not persistently. He went to the door and fingered about the 

 edges, and later pushed it with his hands a number of times. 



Third trial. Ou the third trial No. 2 examined the door with his fingers 

 and then took his leisure about the cage for the remainder of the time. 



Fourth trial. On the fourth day No. 2 went to the door, but made no 

 effort to get through to the food. He scratched on the glass and later pushed 

 at it. 



Fifth trial. On the fifth day No. 2 went to the door and then climbed 

 the wire part of the cage. Later he went to X and bit at it. Still later he 

 went to the door, but turned away. Two minutes later he returned to the door 

 and pushed on it. He repeated this twice. 



Imitation tests. — No. 2 imitating No. 5. — The two animals were put into the 

 cage together in each of the following tests. 



First test. No. 2 watched No. 5 most of the time, but did not often see 

 exactly what No. 5 did. He saw five times in fifteen. Once he got food at 

 the door. 



With No. 5 out No. 2 worked rather persistently at the door for a few 

 minutes. Then he climbed the post and bit the plug. Several times he 

 came back to the plug and bit it. 



Second test. No. 2 was very attentive and got a good view of No. 5. 

 He saw her pull the plug five times in eight, and each time he saw her go 

 from the string to the food. 



When No. 5 was removed No. 2 saw the food at the door, but made no 

 effort to get it. 



Third test. No. .5 was very eager and pulled the plug repeatedly, getting 

 the food as rapidly as it could be supplied. She pulled when the door was 

 open as well as when it was closed. If the door was not closed after she had 

 gotten food she pulled the plug, but after several pulls she ceased if the 



