40 
FIRST BOOK. 
7. Those are their gills/' said his father^ in 
answer to Harry's questions. " By them the 
tadpoles breathe, for, like fishes, they have no 
lungs." 
8. Day by day Harry watched the tadpoles, 
and, as they grew^ 
they changed so 
much that he was 
quite puzzled. He 
thought he could 
see little legs 
growing on them, 
and their tails 
and gills seemed 
to be shrinking 
away. 
9. Father, do 
come here," he 
said one day. , I 
have often thought 
that the tadpoles 
were changing 
into something else, and now I am sure of it." 
Mr. Green smiled. " I have no doubt they 
are," he said. " They are turning into little frogs." 
10. Harry's eyes opened wide in wonder. 
Frogs, Father!" he cried; then they were 
frogs' eggs which we brought home.^' 
Different Stages in the Growth of the 
Tadpole to the perfect Frog. 
