46 



JOHN LINCK ULRICH 



TABLE IV 



Giving Summary of Retention Tests 



Maze with Two Other Problems 



TABLE V 

 Inclined Plane with Two Other Problems 



DISCUSSION OF RESULTS 



That one trial daily or at slightly longer intervals requires 

 fewer trials to complete learning or an integration is of some 

 physiological interest. One might argue that, after the first 

 trial, if the rat had had a little food, a second trial, immediately 

 following would heighten the tendency to perform the same 

 movements, and this tendency would be effective in all suc- 

 ceeding trials up to a point when the animal became slightly 

 fatigued. Such a hypothesis would be similar to physiological 

 summation of stimuli in the local functioning of reflexes. But 

 results prove that anything approaching such an explanation 

 is untenable; one daily trial is economically more effective than 

 several trials given concurrently on the same day. 



