14 



RESULTS. 



Behavior: As a rule, as soon as a rat entered the 

 hood, it made directly for the door of the latoh box, the 

 more timid ones approaching more cautiously. Sometimes 

 they ran around and over the box, hut eventually tackled 

 the door. All the rats were very active and rare was 

 the case of indifference and utter helplessness. It was 

 often a pleasure to watch their eagerness to get into the 

 problem box for food. Usually this characteristic, in a 

 high degree, was a correlate of the ability to learn. It 

 was often noticed that movements were made which were far 

 more complex than was necessary to solve the problem. 

 Especially was this true when a solution to a problem was 

 made in some unique way. The simple movement of raising 

 the latch by the snout was all that was required to open 

 the door. Seldom was it the case that a rat adopted this 

 satisfactory and simple method from the very beginning 

 and maintained it throughout learning. Some modification 



