48 
SECOND BOOK. 
up of ring- like portions; these are covered by a tough 
or horny skin, and they overlap each other in such 
a way that the body is not stiff, but is able to move 
freely.” 
7. “ The wings as well as the legs are fixed to the 
chest,” said Arthur. “ Have all insects wings?” 
“ No, but most have,” said Mr. Johnson. “ Gen- 
erally there are two pairs 
of wings, or else one pair 
of wings overlapped by a 
pair of wing-cases, as in 
the beetles. Now notice 
the insect’s head. It is 
not in rings like the rest 
of the body. At the sides 
the eyes are placed; and 
very wonderful eyes they 
Portion of a Fiy s Eye (magnified). are. They are not single, 
like our own, but each is 
really a mass of little eyes, numbering many thou- 
sands in some insects.” 
8. “What are those thin things that grow out like 
long horns from some of the insects’ heads?” inquired 
Arthur. 
“They are feelers,” replied Mr. Johnson, “and 
that is a good name, for the insects feel their way 
with them. 
9. “ While speaking of the head, we must not 
forget the mouth. This is not easy for you to see, 
