294 HARVEY CARR 



Vision is detrimental because of the abstractive effect of retinal 

 stimuli. 



The advantageous features of vision may be explained in 

 either of two ways: Retinal stimuli exert a tonic and stimula- 

 tive effect upon organic activities and thus promote learning 

 capacity, or one may assume that blind animals are at a dis- 

 advantage because of certain deleterious effects of the operation. 



Vision may possess other functions in the maze situation; our 

 facts are inconclusive on many points. 



These conclusions apply merely to the situations obtaining in 

 our experiments; other potentialities of vision may be realized 

 in different types of situation. 



