ACQUIRED SPECIFIC REACTIONS TO COLOR 



169 



With the other eight crabs, the majority of the reactions fall 

 to the colored light used in the preparatory stimulation. There 

 exists, therefore, very strong, although not absolutely conclu- 

 sive, evidence that Oregonia gracilis acquires by exposure to 

 the action of colored lights, a specific chromotropism for the 



light thus used. 



TABLE V 



Shows the Reactions of Individuals which Had Been Exposed to 



Yellow Light 



R Y G B W 

 Figure 5. Shows the curve of distribution of the reactions of Table V 



TABLE VI 



Shows the Reactions of Individuals which Had Been Exposed to 



Green Light 



