THE HABITS OF FROGS 147 



known to be that of reservoirs. In the spring they 

 enable the spawn to be ripened by drawing on the 

 food material which they contain. Frogs do not 

 feed during the excitement of the spawning season 

 in March, and if it were not for this effective resource 

 their bodies would certainly sink exhausted during 

 the exceptional strain of this period. 



