DIVEKSE COMPONENTS 



355 



50 



100 150 



250 300 350 400 



200 



Hours 

 Fig. 177. Eate of regeneration in relation to time. TaU of tadpole of Sana 

 clamitans. At zero time lengths of tail (AL) were cut off, varying from 6 to 62 per 

 cent of the original tail length. In successive periods of 2 to 6 days ' duration the rates 

 of replacement of tail length were measured, as % of the original tail length/hour. 

 Data of Zeleny ('16, p. 120). 



Regeneration (fig. 177) in course of time accelerates, and later 

 decelerates. In whatever interval the rates of net gain be com- 

 pared (fig. 178), the construction of new tissue is faster when the 

 amount missing is greater. The processes end sooner when the 



50 40 30 

 Deficif-of Tail 



Fig. 178. Eate of regeneration in relation to mean deficit of tissue (AL). Length of 

 tail of tadpole of Sana clamitans. The initial d£ficit was created by cutting off from 6 to 

 62% of the original length of tail. The mean rates of regeneration in length, in % 

 of the original length/hour, are computed from initial periods of two durations; A, 6 

 days; B, 12.5 days. Same data of Zeleny ( '16, p. 88). 



