State Aqricvltvral Society. 
585 
web of silken threads to give it a more secure foothold. It moves 
about but little, crawling very slowly, with its mouth to the surface 
on which it is crawling, placing there a silken thread to aid it in 
clinging. It seldom quits the leaf on which it is placed, if this is of 
sufficient size to fully feed it. 
This worm grows to nearly or quite an inch and quarter in length 
and 0.15 in thickness. It is slightly thickest in its middle and more 
tapered toward its hind than its fore end. It is divided by transverse 
constrictions into thirteen segments including the head, the two last 
segments being less distinctly separated. It is of a pale green color, 
similar to that of the leaves of the cabbage and Swedish turnip, and 
along the middle of the back is a darker line. The whole upper 
part of the body above the breathing pores is dusted over with minute 
black atoms, the coarser ones of which are arranged in transverse 
rows, and the surface is clothed with numerous tine, short white hairs. 
Its head is of a flattened globular form, of the same width as the neck 
and is held vertically. It is of the same pale green color as the body, 
with little, if any, glossiness, and is thinly covered with fine white 
hairs. Low down on each side is a row of four black dots, and the six 
or seven minute teeth with which each of the jaws are furnished, are 
also black. 
When it has done feeding it remains at rest upon the leaf about 
twenty-four hours. It then crawls away from the plant and wanders 
about until it finds a suitable situation in Avhich to repose during its 
pupa state, the underside of fence-rails, of stones in a wall, ot 
limbs of trees, or some similar spot where it will be dry and sheltered 
from the rain. They appear to be particularly careful to place them¬ 
selves where no wet will reach them. Thus I have once met with a 
number that on leaving the garden had crawled under the portico of 
the contiguous dwelling, and had there placed themselves along the 
lower edges of the clapboards to remain through the winter where 
persons were passing quite close to them every hour ot the day. 
The very curious operations of these cabbage butterflies in passing 
from the larva to the pupa state, the spiffing of a loop or girdle of silk 
threads around their bodies to hold them in a particular position, 
and the drawing of their bodies out from the old skin in such an 
artistic manner as to have the girt remain around them, were long 
ago stated so accurately by the philosopher Reaumur, that I am able 
to add but little to the account he has given. Observers will frequetly 
be disappointed of the opportunities they expect for examining these 
phenomena, as they take place more frequently by night than by day. 
