300 



WALTER S. HUNTER 



the number of trials during which the ordinate value fails to de- 

 crease permanently below the point reached in the first or second 

 trial the measure of the complexity of a problem in relation to 

 an animal's ability to learn it. 



At the end of the 57th trial, the maze was shortened without 

 disturbing the interrelations of the turns. The tests in this 

 modified maze were continued for two days, and the results 

 appear in Table VII. 



TABLE VII 

 Learning Records for Labyrinth C, and Tests for Kinaesthetic Control 



