THE FROG. 
43 
^^When the frog fly near, it opens its 
mouth wide, flaps its tongue out, and then in 
again, bringing the fly with it. This it does so 
quickly that your eye is scarcely sharp enough 
to notice it." 
7. " Lizards are reptiles, I know," said Harry. 
Are frogs reptiles 
too?" 
''No," replied his 
father. " The rep- 
tiles never have 
gills, and you know 
that a frog has 
them at one stage 
of its life." 
Tongue of Frog put out to take its Prey. 
8. " Then my 
little frogs are just ready to begin their second 
stage of life," said Harry. " Do you think they 
are quite ready to breathe the air?" 
" Oh, yes!" said Mr. Green. ''Just watch the 
movement of their throats." 
9. " They seem to keep on swallowing some- 
thing," said Harry. 
" So they do. They close their mouths, draw 
in air through their small nostrils, and then 
swallow it; and that is the way they breathe." 
