THE FROG 



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

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

 ai)pear three little branched tufts or gills, which serve as 



F\'\. I, — .Strides in llic life-liistory nf the Cmnninii Frof^, frnin tin- nc\v1^--li.'tlclicil 

 t.id|iulcK (/) tn the yuLing frog (8) ; s<i is a magnilicj view uf j. (.-Vfttr Sliv'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 



