212 



E. J. LUND. 



TABLE III. 



Planaria starved 7 days before experiment and kept at 20 C. 3 days before and 

 during tests. Each lot of 80 worms was divided into four groups of 20 each for 

 the tests. 



the same set of twenty animals in each of the bottles i, 2, 3 and 

 4 for the first and third periods will show that the increase is 

 similar in all the bottles. For lot A it is 0.94, 0.91, 1.31 and 

 1. 1 8 for bottles i, 2, 3 and 4 respectively, while for lot B it is 



