QUANTITATIVE DETERMINATION OF LIGHT REACTIONS 2.") I 



E-19 



r 



Ei9. 



b \ 



4 



E 19 



-I 



E-29 



r 



E-29 



+ 15- 



-?■ 



E-29 



Fig. 4 A set of trails made under equal opposed lights by a symmetrically 

 responding larva; a, the test trails; b and c, trails under the influence of balanced 

 lights. 



Fig. 5 A set of trails made under equal opposed lights by an asymmetrically 

 responding larva; a, the test trails; b and c, trails under the influence of balanced 

 light. 



