REGENERATION IN TADPOLES OF RANA CLAMATA. 



283 



Two sets of tadpoles of different ages were used so the data 

 given in the table below are divided into two parts. 



Summary. 



1. The rate of regeneration of a tadpole tail varies inversely 

 as the age of the tadpole. 



2. In successive regenerations from a given level the first 

 and second regenerations are approximately equal. 



3. Regeneration from recently regenerated tissue, and from 

 old tissue of a tadpole tail that has been regenerating at a level 

 nearer the tip of the tail, is almost the same as first regeneration 

 from the same level. 



4. The rate of regeneration in the tail of tadpoles is directly 

 proportional to the distance of the level of the cut from the tip 

 of the tail. 



