726 Journal of Comparative Neurology and Psychology. 



that the ocelli of one side or the other are exposed to light, coming, 

 of course, from the rear. Then the head is swung to the opposite 



/ix. 



^n 



/' 



^. 



</ 



w 



to 



JT, 



y 



a. 



Fig. 2. — Chart showing the positions of fourteen larviie, which had been 

 thrown promiscuously into an illuminated area (the light coming from the top 

 of the chart), the positions being taken in I a few seconds after their exposure 

 to the light and in II one minute afterwards. The individuals are designated 

 by numbers to aid in comparing their successive positions. 



side until the ocelli of that side are exposed, and the action is re- 

 peated. 



The testing movements are seen in other cases. Thus, when a 



