The Reactions of Plauarians to Li^ht 



lOI 



abrupt kinks in the line signifies that at that point the worm exe- 

 cuted decided wigwag movements with its anterior end. The 

 figures are reduced in size from the original records. 



In Fig. 10 is given a specimen record of a Dendrocoelum' which 



Fig. II Phagocata gracilis. This path shows great activity on the part of the worm, and, although 

 it is mostly laid down away from the source of the light, it shows that the worm experienced no great 

 difficulty in moving toward the light. 



came to a standstill after i8 minutes of locomotion. The first 

 movement of this worm was diagonally away from the light, but 

 it soon came back toward the light traversing almost the entire 



