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BENJAMIN SCHWARTZ AND S. R. SAFIR 



(3) that each animal chooses one particular corner from which 

 to escape. The last fact is of the utmost importance, because 

 the labyrinth habit with the fiddler crab involves not only a 

 process of learning, but also the overcoming of a strong incli- 

 nation. By closing the corner to which the animal is inclined 

 to go, the experimenter is in a position to determine whether 

 the animal can modify its behavior. 





The reasons for the individual preferences were by no means 

 evident. Since the animals exhibit a positive phototaxis it was 

 at first supposed that this peculiar reaction was -caused by 



