10 MOTHS AND BUTTERFLIES. 
millions which hatch from the eggs each season, their numbers are 
mostly kept within bounds. 
But to resume our history of the life of the caterpillar. As 
before mentioned, some species make for themselves cocoons ; others 
burrow down into the soil or hide among the fallen leaves at the 
roots of trees; while still others have no covering, and suspend 
themselves by silken webs in various localities. in preparing for the 
pupa state a change takes place in the appearance of the caterpillar. 
Its colors fade: it shortens and thickens; and at length, after move- 
Development of the Moth. 
ments similar to those which it uses in changing its skin in moulting, 
a seam opens in the back, and the larval skin is worked backwards 
and finally off. 
It is now a pupa or chrysalis, looking neither like the caterpillar 
Which it was nor the fly which it is to be. By close examination the 
legs, wings, antennie, etc, may be clearly made out; but how com- 
pactly they are placed together! Not a particle of room is wasted. 
It seems most marvellous that from this inactive, fossil-like creature, 
