FEOG CULTURE 233 



of the backbone, which remains all through. 

 life. 



The period required for the absorption of 

 the tail depends on the species and the tem- 

 perature of the water. The tail of the leopard 

 frog disappears much more quickly than that 

 of either the green or the bullfrog. The tad- 

 pole of the green frog is about as large again as 

 that of the leopard frog. The tadpole of the 

 bullfrog is conspicuous both for its length and 

 girth, and specimens six inches and more long 

 are not rare. 



The rule to sort and grade frequently fish 

 into sizes holds good in frog-culture. It is 

 strictly a carnivorous creature. It will in no 

 circumstances eat anything but living food 

 after the time it is fully developed from the 

 tadpole. It will not only eat live fish and in- 

 sects, but shows a decided inclination to can- 

 nibalism. 



