176 The BO. OR of N AYE'U RiE >- or, 
fervice likewife to macerate them in coloured 
liquors, till they become, as far a8 they are ca- 
pable of it, black, red, or yellow; or they may 
be even left to themfelves, that they may at 
length acquire a colour, by a {pontancous cor- 
ruption : by this means, when the changes are 
properly watched, fome of their parts fhoot 
forth to view, which otherwife efcape the fight, 
or at leaft cannot be viewed diftinctly enough. 
It is indeed the nature of this Worm to have 
its body of a perfect white, and confifting of 
parts not very eafily to be difcerned ; hence 
arifes the vaft difficulty of anatomizing it, un- 
lefs we ufe the method mentioned above. All 
thefe things, however, need be of no confe- 
quence, if one knew how to difleé&t thefeWorms 
when alive, which yet is not eafy to be done, 
fince its parts contract themfelves at that time 
moft {trongly, and alfo are in their own nature 
moft extremely tender. 
If the Worm be opened along the back, 
immediately there appears trickling out a fort 
of ichor of watery humour, gufhing from the 
wounded veffels, and from the heart. This is 
the real blood of the little Worm: after this are 
feen the mutcles fituated under the fkin, which 
move the annular divifions of the body, and 
fome of which go into the very heart itfelf, 
Next is feen the fat, and among this, in the 
middle of the back, the heart {welling out 
fhews itfelf; this is indeed a long pipe, running 
through the whole back quite into the head, 
out of which the veflels fprout branching to all 
the parts. This, however, I never obferved in the 
Worms I am treating of, but have frequently 
in Silk-worms. In the anatomy of the female, 
I thall mention fome other circumftances about 
the heart: if we purfue this diffection further, 
prefently the ftomach rifes to view, furnifhed 
with numberlefs pulmonary tubes, which, being 
made up of fibres eafy enough to be difcerned, 
if it is cut, recedes very eafily from its internal 
coat. This to appearanceis membranaceous, and 
is three times thinner than the ftomach itfelf ; 
this fame tunica, moreover, like the moft tran{- 
parent kind of glafs, is perfectly clear, as well 
“as moft equally fmooth, which indeed is found 
in other infects likewife, and more than all the 
reft in Silk-worms. In the laft Worms I 
diflected, this coat, or internal part of the fto- 
mach, was always {wollen with a fort of mat- 
ter of a deep yellow colour, a little clammy, 
which not only filled the whole cavity of the 
ftomach, but in the back, where the heart is 
placed, was diftinctly feen through the heart 
and the body. In the Worms of Hornets, that 
inner coat of the ftomach fhews to appearance 
like a piece of net-work, the moft curious that 
can be feen, and is of a purple colour. In the 
lower part of the ftomach, where the pylorus 
lies, are four little veffels, through which there 
runsa matter of a yellow colour, a little inclined 
to whitenefs : thefe are firmly knit to the fat and 
air-pipes, and appear here and there through 
the fat, and winding about are carried over the 
body in wreaths; to me, indeed, it feems diffi- 
cult to find out what kind of particles thefe 
are, for they do not appear to be like the 
{affron-coloured veffels, which the illuftrious 
Mapighius has defcribed in Silk-worms, being 
what I have found hitherto in all infects,though 
not always tinged with this yellow colour. 
Whatever be the cafe, after long and unwearied 
fearch I at laft perceive, that in their extremi- 
ties, they, as the clofe guts or ceca of hens, are 
clofed up: to difcover this I ufe the following | 
method, viz. with a fine forceps I take hold of 
the gut, or of the end of the ftomach into 
which the veffels run, and then flowly and care- 
fully draw them out from the fat and intwined 
membranes, and pulmonary tubes; fince they 
could not otherwife be difentangled without 
the utmoft difficulty. If thefe clofed veflels are 
macerated for a little time in fpirit of wine, 
then they appear as if they were covered over 
with glandules, which kind of glandules may 
likewife be obferved in other infects. I have 
called thefe in the Coffus faffron-coloured veffels. 
In Bees it is extremely hard to bring them into 
fight. 
The fat alfo of this Worm, as in the Coffus, 
confifts of globules, an@thefe very globules in 
fome meafure refemble the globules of fat in 
the Coffus; but the fat in this Worm I am 
treating of is not loft during its growing flate. 
Wherefore it may ftill be feen, after the crea-. 
ture is changed into a perfect Bee; if this fat 
be examined more accurately, befides number- 
lefs more minute particles, there are likewife to 
be obferved in it fome little oily lumps, fuch 
as I have before reprefented in the fat of the 
Coffus ; but the ftructure of the fat cannot be 
more exa¢tly examined, unlefs we view it laid 
ona very thin plate of fine glafs, a fingle mi- 
crofcope being pafied between, right againft 
the fight. In the fat, which is mixed with ex- 
tremely thin membranes, and with the pulmo- 
nary tubes, fome fmall particles are here and 
there feen, wrinkled and contracted, and fome- 
what inclining toa pale purple, and in other 
parts nearly whitith. Thefeare the beginnings 
of the air bladders, which afterwards in Bees 
are filled with air, and mix themfelves with the 
pulmonary tubes, to which they have hitherto 
but a flight cohefion; juft as the lungs in ani- 
mals, that have not yet ufed refpiration, fo thefe 
air bladders are contracted in thefe fubjects. 
On the oppofite fide, near the head of the 
Worm, there appear fome other veflels, which: 
curl like the tendrils of a vine, in the fame 
manner as the clofed veffels juft defcribed; nay, 
and they are fo fimly braced with membranes, 
fat, and pulmonary tubes, that I have found it 
impoffible as yet to feparate them; whence I 
have alfo been unable fo accurately to difcover 
their ftructure. Thefe veffels are double, and 
at laft meet in one little tube, which, after that, 
fhoot on the outfide under the tongue of the 
Worm, and there become ftronger and tougher, 
and then {well outwards in akind of foft pimple, 
pervious by an opening : from this prominence a 
glutinous humour, the matter of the filaments, 
is 
