35 



A few poinds in regard to the learning of the in- 



clined plane box problem are of interest. The movements 

 of the rats were more complex than those demanded in 

 learning the maze or latch-box. At first the plane was 

 set off by the rats accident ly. Usually the noise of 

 the opening of the door startled them, but gradually 

 familiarity with the plane and the method of opening the 

 door was established. This characteristic was first 

 evident on the sixth or tenth day. At first movements 

 were organized to push down the plane. Often when a rat 

 had pushed the plane down, it would remain still for a 

 time or wander off before going to the door of the box. 

 There was no reaction to the noise of the door opening, 

 and it appeared that an additional neural association of 

 movements must be made before reaction could be immediate. 

 When this had taken place, learning was- rap 



The records for the three problems, when learned in 

 succession. are founttr on Tables III. IV and V.a.b and $ 



