(a ANTITATIVE DETERMINATION OF LIGHT REACTIONS 241 



E-19 



E-19 



^ 



E-19 



b \ 



9 



8^% 

 49 



840/0 

 49 



83O/0 

 49 



10 



Fig. 9 The complete record of an individual larva run at equality, selected 

 to represent the average deflection of all the trails* made under the influence of 

 equal lights. 



Fig. 10 An average set at 8| per cent difference 



Figures 9 to 14- show graphically the amount of deflection 

 occurring at the various intensity differences. They are photo- 

 graphs of actual trails, selected because they represent the aver- 

 age deflection of all the trails run at the stated intensity difference. 



