33] 



RATE OF REGENERATION— ZELENY 



33 



generally true of tadpoles of this size in Rana clamitans. The percent 

 regenerated is somewhat greater for the smallest removals than for the 

 others. After the maximum is reached there is a tendency toward de- 

 crease of the regenerated region though this is hard to determine with 

 accuracy because the boundarj- between old and new tissue becomes 

 more and more obscure as time goes on. For this reason the data for 

 56 days of regeneration are not as reliable as the others. 



4 6 8 10 121/2 18 



— >- Days 

 Figure 2. Specific regenerated lengths during the regenerative period for 

 both first and second regenerations. Tadpole tail of Rana clamitans. Series 

 3676-3765. 



Broken line = second regeneration. 

 Unbroken line = first regeneration. 



2 5 7 9 ll',4 15% 



— >- Days 

 Figure 3. Change in specific rate of regeneration during the regenerative 

 period for both first and second regenerations. Tadpole tail of Rana clamitans. 

 Series 3G76-3765. 



Unbroken line = first regeneration. 

 Broken line = second regeneration. 



