THE ESCAPE OF THE MOTH. 
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the other did, the outer layer of skin unbroken ; 
and this answers the purpose of a door, and is 
pushed open by the moth. 
But how do you think the moth of the great 
caterpillar, that makes its cocoon in the very 
heart of the tree, gets out? The trunk is very 
thick, and there is often a long passage, from the 
chamber where the chrysalis lies, to the open air. 
The moth is a large one, and there would be no 
room for her wings to expand, either in the 
chamber or the passage. Some other contrivance 
is needed than the door, or the clue of thread, and 
accordingly we find one quite as ingenious. 
The chrysalis is furnished with sharp points 
upon its head, and it keeps pushing these against 
the cocoon until it has broken it. Then it wrig¬ 
gles itself out of the hole, and works its way 
gradually along the passage, helped on by the 
sharp points that it uses like arms. It reaches 
the bark just in time for the moth to come out. 
She finds herself close to the outlet, and has 
nothing to do but to spread her wings and 
%• 
But the moth that is buried in the earth seems 
even worse off than that in the tree. She is a foot 
below the surface, and there is no passage along 
which she can make her way. She is shut up in 
darkness, and as it seems in a living tomb. But 
