THE FROG. 
41 
11. ''They were; or frog- spawn, as we call 
them/' said Mr. Green. 
Harry watched the queer creatures more than 
ever now, until at last he had no tadpoles at all, 
but perfect little frogs instead, that had to raise 
their nostrils above water to breathe. 
THE FROG. 
1. ''You must set the little frogs free now, 
Harry," said Mr. Green. " They have no longer 
any wish to eat the water-weeds on which tad- 
poles lived, but want insects, slugs, and other 
kinds of frog's food now. Besides, they can no 
longer breathe water, for they have lungs, as we 
have, and need to breathe in the air." 
2. " But do not frogs go into the water some- 
times?" asked Harry, who did not seem to care 
to lose the young frogs now. 
" They do," said his father; " and they can stay 
under water much longer than a man can. 
3. "We may know that frogs are good swim- 
mers by the look of their hind feet, which are 
webbed. There is a very thin skin between the 
long toes. 
" On land the frog leaps by means of its long 
hind legs. It is fond of living in moist, swampy 
