386 



PEOCEEDINGS OF THE AMERICAN ACADEMY. 



TABLE VII. 

 Summary of Reactions of Ranatra to Large Light alone, to Small Light 



ALONE, AND TO BOTH LiGHTS USED SIMULTANEOUSLY. 



a considerable number of trials ; then tests were again made with the 

 lights singly. This was not altogether necessary, since a change in the 

 phototropic state of the animal could usually be told at once by its 

 behavior in the runway. As it became negative, instead of going out 

 toward the incandescent light in the other runway, it would attempt 



