REACTIONS TO LIGHT IN VANESSA ANTIOPA 



385 



By referring to this figure, which represents the course of a 

 given individual in different intensities of light it will be seen 

 that the angle of deflection is essentially the same in all, in spite 

 of the fact that the illumination varied from 76 to 3397 mc. 

 This is a typical case. It seems to show that the degree of 

 deflection is within wide limits independent of the intensity of 

 the light. 



Fig. 9 Diagram showing the angles of deflection made by butterfly 10/8-b 

 (left eye blackened) when exposed in light of different intensities. A A, limits 

 of horizontal beam of light; 14-25, successive trials; 76 and 3397, intensity of light 

 in meter candles at the corresponding points. Note that the insect deflects at 

 about the same angle with the rays of light, no matter whether the trials are 

 begun in an intensity of 76 mc. or in an intensity of 3397 mc. 



The results presented in table 2 support this contention. They 

 demonstrate that, while the degree of deflection varies greatly 

 in different individuals and in the same individual under different 

 conditions, there is no apparent correlation between it and the 

 intensity of the light. Since the degree of deflection is a measure 

 of the difference in tension of the muscles of the legs on the two 

 sides of the body these results also show that there is no apparent 

 correlation between this difference in tension and the intensity 



