562 



W. W. SWINGLE 



date the experiment began, many of the controls, as was men- 

 tioned before, had completed metamorphosis by June 22. 



From July 8 on, however, the larvae became so weak and slug- 

 gish that it was absolutely necessary to feed them from time to 

 time. 



Every five days a few finely crumbled bits of bread were fed the 

 tadpoles. This meagre diet, while sufficient to keep the animals 



<*> 



Fig. 14 Photograph of larvae starved one hundred and twenty-four days. 

 The young frogs are the same age as the tadpoles. The shrunken appearance of 

 the larvae is partly due to their being immersed in alcohol shortly before the 

 picture was taken. 



alive, was not nourishing enough to permit growth. The ani- 

 mals moved about the containers very feebly and only when vio- 

 lently disturbed. Most of the time they lay upon the bottom 

 of the container. 



These three tadpoles very likely could have been kept alive by 

 underfeeding for an indefinite time, but unfortunately they were 

 killed by accident, and at a time when it was impossible to pre- 



