514 



WILLIAM L. DOLLEY, JR. 



In experiment 3 the rate of locomotion of Vanessa in continu- 

 ous light and in intermittent Kght of a flash frequency of 10 per 

 second was ascertained. One-half of the disc previously de- 

 scribed was removed. An insect was first given one trial in 

 continuous light, that is, it was allowed to walk over the 300 cm. 

 course toward the source of light and its rate of movement was 

 ascertained. It was then given a trial in intermittent light. 

 A third trial followed in continuous light. During this trial 

 the motor was allowed to run. This third test was given to 

 determine the effects, if any, of the 'hum' of motor. This 

 series of three trials was then repeated a second time, thus giving 

 two trials for each insect under each of the three different con- 

 ditions. The illumination in the trials in continuous light 

 ranged from 1500 m.c. at one end of the table to 1.56 m.c. at 



TABLE 5 



Rate of locomotion of Vanessa antiopa in intermittent light of a frequency of inter- 

 ruption of 16 per second. The period of illumination is 3 times as long as the 

 period of non-illumination 



