98 The BOLO K 
when it endeavoured to wind and twift the 
pofterior part of its body about the extremities 
of leaves ; for then it faftened itfelf in the place 
with its feet, making no ufe of its fore legs at 
the fame time. When it walks, it ufes only 
the fore legs, and then draws after them the 
hinder part of its body. This is likewife the 
cafe in regard to the Caterpillars, before men- 
tioned, which have many legs; and which 
likewife change into Butterflies fo conftantly, 
that I have hitherto obferved no example to the 
contrary. ‘The points of refpiration were feen 
to open in the furface of the body, and the 
pulmonary tubes were tranfparent through the 
ikin. In the hinder part of the body, the heart 
thewed itfelf alfo, beating. 
While thefe little Caterpillars are {mall, they 
are of a colour mixed of a yellowith white and 
pellucid green, which by degrees improves and 
grows ftronger. Even while they are, as it 
were, {till in their cradles, a narrow line of a 
deep green colour, which denotes the aliment 
contained in the ftomach, is feen through their 
fkin ; and this becomes of a more and more 
dufky green, the more the Caterpillar ap- 
proaches to maturity ; and the Caterpillar itfelf 
then alfo gets a much greener colour all over, 
only that it continues of a yellowith white about 
the belly. Thefe little creatures feveral times 
change the fkin within thefe warts, and grow 
whitith for a time, on cafting it. 
The inner fubftance of the wart is their food, 
which they immediately begin to eat, as foon 
as they come out of their eggs. About that 
time their excrements alfo are found in the 
tubercles; and there is the greater quantity of 
them accumulated, the more the Caterpillar is 
grown. I have fometimes found fo great a 
quantity of thefe excrements in the tubercles, 
that it was three times bigger than the body of 
the, infeé&t. This principally proceeds from 
rain, which fwells thefe feces, and fometimes 
kills the little Caterpillar. This moft com- 
monly happens, when it has already bitten 
through and perforated the coats of its wart, 
or tubercle. Thefe habitations are commonly 
pierced through by the Caterpillars, when thefe 
infeéts are arrived to their full fize; for then’ 
they always eat a hole through their tubercle, 
and then thruft the hinder parts of their body 
through the hole, fo that they may caft out 
their excrements, Tab. XLIV. Fig.1.y. The 
Caterpillars behave in this manner chiefly in 
rainy weather ; for then their excrements {well 
vaftly by the force of the wet, and would oc- 
cupy too large a fpace, being otherwife not 
bigger than {mall grains of fand. 
In procefs of time the whole fubftance of 
the wart is fo cleanly eaten out by the Cater- 
pillar, that abfolutely nothing remains of it 
but the two outmoft coats of the leaf. After 
this the creature ceafes to eat, though it fome- 
times alfo abftains fooner. It is indeed very 
_ worthy of confideration, that the Worm in this 
excrefcence finds its aliment in fuch plenty, 
that it is never in want.. On June 29, I ob- 
ferved that many of thefe Caterpillars had crept 
of NA TUR E; or, 
out of the mouths or orifices of the verrucles, 
or little warts; nor could I, notwithftanding, 
find any of them either on the tree, or under 
it on the ground. In another tubercle, which 
I then opened, I found a dead Caterpillar. In 
another, the little creature had been entirely 
confumed, its remains refembling only a thin 
fkin; and near it lay a Worm without legs, 
which had probably confumed the entrails of 
the Caterpillar, and afterwards had crept out 
of the tubercle, in order to undergo its proper 
change. AsI had unluckily given this Worm 
a little wound, I could not further profecute its 
changes. I fhall not prefume to affirm, as a 
certainty, that the vifcera of the dead Worm 
were confumed, or had been pierced, by this 
creature. . 
In order to inveftigate further what is done 
by thefe little Worms, I brought fome leaves 
and little branches of Willow-trees into my 
chamber, and there put them in moift fand. 
But fo it happened, that the Worms of thefe, 
having quitted their tubercles, got into the fand 
out of my fight. As I imagined it was the 
want of food that made them leave their abode 
fo quickly, I put fome leaves and entire warts 
of them upon the fand: nay, I likewife offered 
fome of them a mafs or lump, prepared of 
fome bruifed tubercles, in order to invite them 
to eat; but all was to no purpofe. I therefore 
finally enclofed fome of them in a dry box, 
into which I had before put fome rotten wood, 
that I might fee whether they would make 
their webs there. All thefe died likewife, 
pining away, fome fooner, fome later: where- 
fore I at length learned, that they could not 
live naked or uncovered in the air. 
On the sth of July I obferved, that fome of 
thefe little Worms had dug into the fand, and 
there began to weave webs; and this was the 
firft opportunity I had of difcovering any ap- 
proach toward their change. For, when I di- 
ligently examined the fand on the infide, I 
found a great number of them in it, fome of 
which lay much deeper than others. And 
thus I at length difcovered, that thefe little 
creatures, after they have eaten {ufficiently, 
quit the Willow-leaves, and fall; and then dig 
into the earth, in order to weave their webs 
there, and fuffer other changes. | 
Out of this fand likewife I took fome per- 
fect webs. They were of an oval figure, Tab. 
XLIV. Fig. 1v. @; fo that if they were ex- 
pofed on the furface of the earth, the moifture 
or rain could not do them great harm. I have 
likewife obferved fome Spiders woven up in 
webs. Thefe webs were of a bright purple, 
approaching to fcarlet. I afterwards opened 
one of thefe webs, woven by the infects ; - but 
found that the Caterpillar, in the infide, was 
not yet changed. On the 6th of July I cut 
open fuch another web ; and in this alfo there 
the infect ftill lived, in full vigour. In the 
third web which I opened, I found the crea- 
ture juft on the point of fuffering its change. 
Its green colour began by degrees to difap- 
pear. The body became a faint yellow, and 
decreafed 
