OF PAPILIONACEOUS INSECTS. 47 
arrangement the larvee, which on hatching emanate 
from the upper end, cannot disturb the adjoining eggs. 
The eggs of many Papilios are so formed, that it is 
evident they are intended to be placed in this 
position. For example, those of the Puss Moth 
(Cerura Vinula) have the case of a gummed trans- 
parent substance, while the rest is cinereous and 
opaque. The Emperor Moth lays eggs, by which 
the caterpillar can make an easy retreat ; these are 
piled on their side, in the same manner as bottles of 
wine in a cellar. 
The Lacky Moths (Clisiocampa neustria,) de- 
posit their eggs on the twigs of trees, on which they 
are arranged with such extraordinary regularity and 
neatness, that they resemble pearls set by the hand 
of the most skilful jeweller. Hence the name given 
to them by gardeners of “ Bracelets.” They are 
deposited in close spiral circles, of from fifteen to 
seventeen distinct rows, having their interstices 
filled up with a tenacious brown gum, which secures 
them against the winter’s cold, and preserves them 
from the attacks of devouring insects. Each of these 
depositions consists of two or three hundred pyrami- 
dal eggs with their tops flattened, having their axes 
perpendicular to the circumference of the twig to 
which they are attached, which will be more easily 
understood by the following figure : 
