THE FROG 



CHAl'. 



weeds. They are thus in the main vegetable-feeders, not 

 carnivorous, Hkc the adult frog. On each side of the head 

 appear three little branched tufts or gills, which serve as 



Fig. I. — St.iges in the life-history c^ the Common Frog, from tlie newh-h.ttched 

 tadpoles (/) to the \oung frog (S)"; 2^ is a magnified \'icu of 2. (After Sli\ art). 



respiratory organs (2, 2"), the tadpole, like a fish, breath- 

 ing air which is dissolved in the water. After a while the 

 gills shrivel up and the tadpole then comes periodically to 

 the surface to breathe, lungs having in the meantime made 



