374 



DWIGHT E. MINNICH 



single record of this kind is shown in figure 10, A. This was ob- 

 tained from an animal which subsequently became wholly unre- 

 active. Its aberrant tendencies may, therefore, have been due 

 to an abnormal condition. In any case it is significant that, al- 

 though the bee looped toward the covered eye, yet it progressed 

 toward the light source. Consequently, this was not a case of 

 reversal of phototropism. 



Instances somewhat similar to the one last mentioned have 

 been described by Dolley ('16, p. 373) for the butterfly Vanessa. 



O 



\ 



Fig. 10 A. Record of a bee in directive light, showing loops toward the 

 blackened eye. B. Two records of a bee in directive light which showed no 

 deflection, although the left eye was blackened. 



Although positive to light, this insect with one eye blackened 

 occasionally turned toward the covered eye instead of toward the 

 functional eye. Possibly results of this sort are to be attributed 

 to the effect of contact stimulus afforded by the covering of the 

 eye, as indicated by Dolley ('16, pp. 394-399). This will be dis- 

 cussed more fully in a subsequent portion of the paper. 



2. Non-directive light 



a. Amount of turning. In non-directive light, bees with one eye 

 blackened tended, in general, to turn more or less pronouncedly 

 toward the functional eye. As was to be expected, the course 



