THE FAMILY OF FROGS 



91 



does not stop here. His later behavior is one of the 

 surprises of nature. Usually during the same summer in 

 which he hatched, he begins to undergo some changes that 

 almost make him over into a new animal. These are both 

 inside and outside changes. On the outside he begins to 



Figure 22. Stages in the life cycle of the frog, 

 grow legs, first the hind pair where the tail joins the body, 

 and later a front pair close to the head. During this time 

 the tail is gradually being absorbed by the blood corpuscles 

 that circulate through it. By means of the blood this 

 material is turned over to the growing animal very much 



