4S THE FLY WITHIN THE PUPA. 
trunk is rolled up into a little case, which 
is in the front of the face ; and the wings, 
instead of being twisted, are curiously 
folded up ; so that, although of their full 
size, they occupy an astonishingly small 
space. The diminutive eggs, which, 
you may remember, I described as clear 
and colourless, are now become of their 
full size, and of the colour which they 
are to have when laid. 
Lucy. Then all eggs are not white ? 
Mother, Some are yellowish, some of 
a pale greenish hue, and others pale blue. 
Lucy, And, mamma, how long have 
the moths been of the full size. 
Mother, It is difficult to be certain 
on this point; but from some experi- 
ments it has been inferred, that by the 
time the caterpillar has completed its 
growth, the fly has also reached its full 
size. 
Lucy, Then why need it remain so 
long in the pupa ? It might as well come 
out of the caterpillar, and fly at once. 
Mother, Certainly, if Providence had 
