The 
generation. I fhall now defcribe the probofcis, 
or fucker, the throat, ftomach, inteftines, and 
other adjacent parts. 
the ovary, brain and nerves, and then add 
fomething concerning the outward fkin, with 
which I fhall conclude this anatomical defcrip- 
tion. 
The Loufe has neither beak, teeth, nor any 
kind of mouth, as doctor Hooke defcribed it, 
for the entrance into the gullet is abfolutely 
clofed: in the place of all thefe, it hasa probof- 
cis or trunk, or, as it may be otherwife called, 
a pointed and hollow aculeus or fucker, with 
which it pierces the skin, and fucks the human 
blood, taking it for its food into the body. 
But this probofcis cannot be fhewn, on account 
of its extreme fmallnefs ; nor can it be diftin- 
guifhed, unlefs a perfon happens to fee it by 
chance. | 
At the extreme point of the head, when 
preffed out artificially, and with a particular 
attention, there appears an obtufe prominence, 
Tab, II. fig. 111. @. which being hollow in the 
middle of the infide, bends back into itfelf, 
and goes into the body, but has no aperture 
or opening. From this the probofcis 4, or 
fucker, is obferved fometimes to proceed, and 
wherefore this part is, as it were, the fheath or 
cafe of it, wherein it is laid up. 
I cannot illuftrate this tru€ture or machinery 
by a more proper example, than by that of 
the horn of a fnail, which is likewife turned 
into itfelf on the infide, and is again ftretched 
out, but there is no perforation: wherefore, if 
the probofcis or fucker was placed at the end 
of it in this infect, inftead of the real eye 
which we fee in the fnail; one might in fome 
meafure form an idea how the probofcis, or 
fucker, is wrought in this infect, and worked 
up with admirable art by the fupreme architect 
of the univerfe. 
If the whole little theath or cafe be after- 
wards examined, Tab. II. fig. rv. c. it is ob- 
fervable, that the upper end of it is thicker 
than the lower, and is {wollen like a muth- 
room ; fo that it appears from hence, that the 
little foot on which it ftands is {maller than its 
top. When one preffes the probofcis, or fucker, 
and its fheath on the outfide, we thall find that 
the end of the latter is abfolutely blunt and re- 
fembles the head of a pollard willow tree, ha- 
ing all its branches cut off; we fee alfo that 
there are here and there certain pointed parts 
or claws d in it, which, as well as the fheath, 
and the probofcis or fucker, are of a light brown 
colour, and are tranfparent. I ‘hall prefently 
fhew the ufe of thefe claws; there is alfo a 
crooked probofcis or fucker ¢ in the middle of 
them. The outward skin of the fheath which 
is annexed to the probofcis, and from which 
its head is prominent, is of the fame texture 
with the reft of the skin that covers the Loufe; 
_ for it confifts of grooves and pellucid globules, 
4 I fhall explain hereafter, when I treat of the 
skin. 
Pel eo4 2 POR OY 
I fhall after thefe treat of 
of MEONGS BE GT S. a3 
If we examine that part of a Loufe’s head 
at the time when it is feeking out fome pore 
of fweat in the hand, wherein to fix its pro- 
bofcis or fucker, a fmall line of a pale brown 
colour is then prefented to us; which appears 
vifible through the head, and has its fore part 
more deeply coloured. This little line is no- 
thing elfe but the theath itfelf, with the probof- 
cis hidden in the infide. 
_ But before I explain the ufe of this probof- 
cis or fucker, and its manner of rifing, it feems 
neceflary to defcribe the figure, fituation, co- 
lour, texture and motion of the gullet, fto- 
mach, and inteftines: for thus the method 
whereby the probofcis performs its fuction, will 
be more eafily underftood. The cefophagus or 
throat isa very {mall canal, fig. 111. f; which 
one cannot fee at any other time, but when 
the blood afcends through the probofcis or 
fucker into the mouth, and paffes through this 
into the ftomach, It is fituated a little behind 
the eyes, and feems to be carried up above the 
brain: the reafon that I think fo is, becaufe it 
appears there very clearly at the time of fuc- 
tion; fo that probably it runs immediately under 
the skin of the head. In the neck it is fome- 
what enlarged g, and afterwards it grows {mall 
again in the back J, untill it terminates in the 
{tomach, near which I have obferved it, like a 
very {mall, clear, and tranfparent thread, where- 
in a perfon that diffects it fometimes obferves 
blood, and fome other fubftance, which appears 
like the contents of the ftomach. I difcovered 
the whole gullet, in the action of fucking, as 
before defcribed ; for it is a very difficult mat- 
ter to difcover it in any other manner, becaufe 
in the upper part of the back, and alfo in the 
head and neck, it is very ftrongly connected 
with the adjacent parts. 
The ftomach, fig. 111.72, is lodged partly in 
the breaft and back, but the greateft portion of 
it is in the abdomen. When {wollen with 
blood it appears of a dark brown colour, which 
is vifible through the skin, and is either a faint 
red, or a full or bright brown, as. the con- 
tents of the ftomach are more or lefs changed. 
Where the ftomach joins the breaft above, its 
figure refembles a fork with two teeth; thefe 
are two hidden appendages of £2 the ftomach, 
which go deep into the breaft, and on either 
fide near the gullet and {pinal marrow, and 
reach to the firft pair of legs. Thefe are thofe 
two blackith, tranfparent and coloured parts, 
which J have mentioned in general in the hif- 
tory of the external parts. 
The part of the ftomach connected with the 
abdomen deferves particular confideration ; it 
is formed like an oblong bag, which is here 
and there continually contraéted and again ex- 
tended. When it is empty, it is colourlef, 
and the ftomach and its appendages are tranfpa~ 
rent. But as the ftomach fills, the colour js 
feen plainly through the outward skin. It 
manifeftly confifts of two coats, the outward 
is thicker, the inner very thin, as it is in all 
infects, 
