516 



WILLIAM L. DOLLEY, JR. 



TABLE 6 



Uate of locomotion of Vanessa aniiopa in intermittent lights, the frequencies of 



interruption of which were 22 and 1 per second. The periods of illumination 



and non-illumination were equal 



shown by the results of experiment 4 which are given in table 5. 

 From this table it is evident that 60 per cent of the 10 insects 

 tested moved faster in intermittent hght of this frequency than 

 they did in continuous light. Moreover, the average rate of 

 movement of all 10 insects in intermittent hght was greater 

 than the average rate in continuous hght, being 3.106 cm. per 

 second in the former and only 2.572 cm. per second in the latter. 

 That vibration from the motor did not produce this result is 

 shown by the facts, that the average rate of movement of all 

 10 insects was 0.376 cm. per second faster in intermittent hght 

 than it was in continuous hght when the motor was allowed 

 to run, that one half of the insects moved faster and one half 

 moved slower in the continuous light while the motor was 

 running than they did in continuous light when the motor was 

 not running, and that only one insect moved as fast in the con- 

 tinuous light while the motor was running as it did in the inter- 

 mittent light. 



