32 

 have the same general appearance, a rapid descent takes 



place after a few trials and then a level is reached 

 when the curves are prolonged to a greater or lesser ex- 

 tent. But they differ in that the individual curves of 

 the one, three and five trials daily of the maze are much 

 longer and more irregular than those of the latch box. 

 This may "be said even of one trial of the maze when per- 

 fectly normal rats were used. In all probability this 



difference is due to the maze being a more difficult 

 problem to learn, though it is said to be one where more 

 natural movements are made. The increase in length 

 may be due to the fact that an additional criterion, 

 error- free, has been added to that of time in determining 

 the norm of the maze. It is certain that the rats would 

 have required fewer trials and the curves, as a consequence 

 would have been shorter if time alone had been considered. 

 The length of the curve would then approximate that of 

 the latch box, yet the irregula curves would 



