32 
SECOND BOOK. 
“ They are not as pretty as the birds,” said 
Arthur. “Will and I have been talking about your 
lovely specimens many times since our last visit.” 
3 . “So you have not forgotten what I said about 
the structure of the birds, and how well it fits them 
for the life they lead,” said Mr. Johnson. 
Tortoise 
“ Oh, no!” replied the boys. 
“ Then look carefully at these reptiles, and tell 
me in what way they differ from the birds.” 
4. “ That is easily seen,” said William. “ They 
have neither feathers nor wings.” 
“ They have a tough skin with scales on it,” 
added Arthur. 
5 . “ Quite right,” said Mr. Johnson. “ And the 
tortoises and turtles are protected by strong horny 
