56 

 second will reinforce or reinstate the first. 



At one time we thought that the hunger stimulus had 

 something to do with the greater number of trials neces- 

 sary to learning, when several were given daily, but this 

 stimulus has possibly only an indirect effect. There 

 might arise, because of unsatisfied hunger after the first 

 trial, bodily disturbances which would interfere with the 

 proper functioning of right reactions and would make the 

 second or succeeding trials ineffective. A flow of gas- 

 tric or salivary secretions would produce a loss in bodily 

 tone. Moreover,we must remember that a stimulus when 

 repeated, oftentimes produces depressions, and not always 

 reactions when the tone is not the best. 

 CONCLUSION. 



The more important results obtained from this study 

 can be summed up in a few words. 



When food is used as a stimulus it is important for 

 successful learning that bhe kind as well as the amount 



