396 



WILLIAM L. DOLLEY, JR. 



tive days; three for four days; three for three days; one for two 

 dsLjs; and thirteen on only one day. All of these animals usually 

 turned continuously toward the blackened eye. The behavior 

 was strikingly uniform. This continuous movement toward the 



Fig. 14 Reproduction of trails made by butterfly 7/11 in total darkness (right 

 eye blackened). A, 1-3, trails made in three successive trials immediately after 

 the eye had been covered. B, 1-3, trails made in three successive trials twenty- 

 four hours later. 



blackened eye under conditions in which no light can affect the 

 uncovered eye shows conclusively that the covering of the eye 

 exerts a stimulus of some sort upon the organism. It also shows 

 that the deflection toward the functional eye in light is not due 



