396 



L. H. HYMAN. 



TABLE I. 



COMPARISON OF THE RATE OF OXYGEN CONSUMPTION OF LARGE (OVER 20 MM.) 

 AND SMALL (UNDER 10 MM.) INDIVIDUALS OF Planaria dorotocephala. 



Exp. i. Worms Collected March 12, Last Fed April 2, Tested April 5. 



Temp, r-.j C. 



Exp. 2. Worms Collected March 12, Last Fed March 14, Tested March 17. 



Temp. 22 C. 



Exp. 3. Worms Collected Early Winter, Last Fed April 23, Tested April 26. 



Temp. 21 C. 



Exp. 4. Worms Collected March 12, Last Fed April 30, Tested May 2. 



Temp. 21 C. 



Exp. 6. Worms Collected May 28, Last Fed June 6, Tested June 10. 



Temp. 22 C. 



worms, but it is scarcely likely since the effect of feeding has 

 almost completely disappeared in four days. In Allen's experi- 

 ments (Allen, '19) with Planaria agilis, worms starved 27 days 

 were used, and in that case the difference between the largest 



