ENVIRONMENT AND REGENERATION 



473 



were carried out in finger bowls each containing two tadpoles 

 (one of each size) in the amount of base indicated in the table 

 made up to 200 cc. with distilled water. The solutions were 

 changed daily throughout the experiments. In plotting the 



TABLE 2 

 Regeneration in KOH. Length of tadpoles 24 to 28 mm. 



Total length and readings for ninth and thirteenth days omitted. 



curves the per cent regenerated, taking the amount removed 

 as 100 per cent, was used instead of the length actually regener- 

 ated because, as Zeleny ('16) has shown, '^ Within wide limits 

 the length regenerated in the tail of an amphibian larva is directly 

 proportional to the length removed." Practically identical 



