EMPEROR MOTH. 
Mother. Very well: now examine 
and tell me if these jags simply project 
from the sides, or if they are disposed in 
any particular manner. 
Lucy, They do not stand straight out 
from the sides ; I see that they slope up- 
wards, so as nearly to meet in the middle; 
indeed the two upper rows do meet. 
Mother. Can you find any good rea- 
son for their being so arranged ? Think 
a little, and then tell me. 
Lucy. I do think, mamma, that I 
have found it out. They are placed so 
to prevent other creatures from getting in 
to disturb the pupa, for these stiff jags 
would run into and hurt them. 
Mother. Very right ; and you may 
observe, from the direction in which they 
are sloped, that the moth can easily press 
them back, when it creeps out. 
Lucy. That is, indeed, a wonderful 
contrivance ; but how do those, that have 
not this sort of door, get out of their 
thick cases ? 
Mother. There is a nice contrivance for 
D 5 
