The HISTORY of INSECTS. 
the other more acute. It appeared tinged with 
a watery colour, and had an extended {mooth 
furface. Thefe eggs lay loofe and difengaged 
in thefe tender tubercles. © There was no par- 
ticular little cell; but they were every where 
equally furrounded with the inner fubftance of 
the tubercle. But when the wart afterwards 
becomes larger and harder, and by degrees 
lofes its ftiffnefs and tendernefs by accretion, 
then it is obferved, that it infenfibly opens on 
the infide ; and in procefs of time is divided, 
as it were, into two diftinct parts: in one of 
which only an egg is placed, Fig. 1. 0, and is 
gradually increafed and augmented. 
About that time one may very diftinctly fee, 
that the egg is no where fixed or annexed to 
any thing, nor has any veflels, filaments, fibres, 
or any other ties, by the help of which it may 
cohere with the wart, and receive nourifhment 
from it. Indeed, it never has any certain place 
in the tubercle; for it is fometimes fixed in 
this, fometimes in that fide: it is fometimes in 
the middle: it is fometimes at a greater or lefs 
diftance from the chink, which is naturally ob- 
ferved in the body of the tubercle. There 
are as yet no excrements found in the wart; 
but all things appear pure and clean. 
It is very certain, that this egg is then in a 
ftate of nourifhing; for one may plainly fee, 
that it is confiderably increafed, from time to 
time, and augmented. But the moft obvious 
fiens of this are obferved chiefly in thofe Worms 
which are a little older; for in fuch the fore 
part of the egg is confiderably {wollen, fo that 
even the head and two eyes of the Worm or 
Caterpillar, enclofed in it, are gradually feen 
through its integuments, and are obferved, 
Tab. XLIV. Fig. 11. p, to grow continually 
blacker. 
If therefore it be afked, how this egg is 
nourifhed? I anfwer, it may conveniently have 
all neceflary food from the effluvia and tranf- 
mitting liquids, which perfpire into the cavity 
of the divided and broken excrefcence, and 
likewife may eafily penetrate the coat whereby 
the egg is invefted; fo that they may be fucked 
in, and fwallowed by the Worm that lies 
within. All membranes ferve to illuftrate what 
I have here afferted; for thefe being put into 
a damp place, are likewife affected by the 
moifture: but when they are fufpended wet in 
the air, or are expanded, again they exhale, by. 
a contrary action, all the moift humours which 
they contain. Nay, it is plainly feen that gum 
tragacanth, though tied up in a membrane, is 
notwithftanding confiderably fwollen, when put 
in a moift place. But here it deferves particu- 
lar notice, how powerfully falt of tartar at- 
tracts water to it. In the roots of trees and 
herbs, wherein open pores are not yet demon- 
ftrated, no other mode of nutrition can indeed 
obtain or prevail. However this matter be, I 
think the juice, perfpiring from the fubftance 
of the warts, feeds the Worm that is thus con- 
- tained within it. 
Now, as an egg is nothing elfe but a Nymph 
enclofed in the pellicle, not yet having the firm- 
V7 
nefs and ftrength neceffary to break open this 
coat with which it is furrounded, one may: 
eafily comprehend how the Worm, ftill con- 
tained in the fhell of its egg, may fuck the 
nutritious juice which penetrates into the ca- 
vity of the egg. And indeed this obfervation, 
by which it is evident that the egg is nourifhed, 
and becomes bigger, whilft it is and remains 
an egg, moft ftrongly proves, that the egg is 
really the infect itfelf; nor is there any other 
difference between this and that, only in refpect 
of the invefting coat, which prevents our {ee- 
ing the contained infect; though, in fome 
cafes, one may diftinctly enough obferve it 
tranfparently through the fkin of the egg. 
The egg, of which we treat in this place, is, 
in this refpect, different from thofe of many 
other infects, becaufe the latter never increafe, 
but for fome time only cover the contained 
little infects; juft as the membranes of the . 
Nymphs furround or environ the enclofed in- 
fects for a time. 
When this little creature afterwards has 
broken out of its egg, it has the form of a 
thin and {mall Caterpillar, and is twice as long 
as the ege wherein it had been hid a little be- 
fore. It is then always found within the 
tubercle, that the {kin caft off by the little 
infect lies near to it. This little Caterpillar 
is at this time fo fmall, that, if it were deli- 
neated according to its natural fize, it would 
{carce be as big as a point: wherefore I repre- 
fent, Tab. XLIV. Fig. 1. g, it rather at its full 
maturity, as it appears when it hath bored its 
way through the tubercle, and crept out through 
the hole v it made. 
This little Caterpillar properly belongs to 
what are called the Bind-weed kind. If you 
view it. with a microfcope, you will fee it com- 
pofed of fifteen annular incifions, which con- 
{titute the head, thorax, abdomen, and tail. 
The head is of a raven-black colour, and ex- 
hibits, Fig. 111. s, the eyes placed on each 
fide. In the fore part, in the lower region of 
the head, are feen two hard horny or bony 
jaws; the extremities of which are divided into 
many {mall fharp-pointed teeth. With thefe 
the infect, when provoked, is not afraid to 
bite even at a fteel-needle. ‘Thefe teeth are of 
a brownifh red colour, and tranfparent fub- 
ftance. The fix firft legs, tt, each of which 
confifted of five joints and one claw, were ar- 
ticulated with the three foremoft rings of the 
thorax. The two rings immediately follow- 
ing had no legs affixed to them. But twelve 
other legs, Tab. XLIV. Fig. 111. uv, adhered 
to the lower part of the fix rings of the body. 
Finally, the tail was alfo furnifhed » with two: 
fo that this infect has in all twenty legs. In 
the pofterior part of the head, and in the neck, 
as alfo about its tail, there are fome black fpots. 
This Caterpillar, like the Coflus, or Worm of 
the Beetle, had a wrinkled fkin, here and there 
fet with hairs. It twifted and gathered toge= 
ther the pofterior part of its body, like the 
Bindweed Caterpillar. It did not frequently 
make ufe of its middle, or laft feet, except 
U when 
