42 
FIRST BOOK. 
places, and its skin is full of little pores, through 
which both water and air can pass. 
4. " As the frog grows it changes its skin many 
times. When a new skin is ready the old one 
splits so that the frog can get it off. Then it 
rolls the old skin into a ball and swallows if 
The Frog. 
"What a strange thing to do!" said Harry 
Has a frog any teeth, Father'?" 
5. Yes, but only in the upper part of its mouth 
These are useful for holding the prey, but are not 
meant for chewing, as the frog swallows its prey 
whole. It catches the insects with its tongue, 
which is a very curious one. 
6. " The tongue is not fixed at the back of 
the mouth, as ours is, but to the front of the 
lower jaw, so that the loose end points back- 
ward. 
