THOR [eeTOrks Ye ob bMS & Cal Ss: 
pellucid claws ee, ferving thefe infects in place 
of a finger and thumb; for by the former they 
take hold of a perfon’s hair, and by the latter, 
they are able to afcend and run nimbly. 
Under, at, and upon the breaft, where it is 
joined to the legs, and, as it were in the very 
center of it, there appears a fhort whitith 
groove or channel, which is confpicuous through 
the middle of the abdomen, appears of a 
brownith colour, fig. v. vi. and has very ftrong 
motions. On either fide of this groove or 
channel are two bright little parts, like the 
larger before defcribed, whofe appendages they 
are, and which rife confiderably on the infide 
of the breaft, and are there alfo tran{parent. 
The abdomen is divided into fix parts, and 
at the end of it, on the under part, the body 
terminates as it were ina cloven tail. Befides 
gf 
thefe in the middle of the lower part of the 
belly, there is to be obferved a whitith {pot 
like a point, which is alfo tranfparent, and 
moves diftinétly up and down. On the fides 
and extremities of the belly, which is all over 
hairy, are obferved fome pellucid, ruddy, little 
bodies; and over the whole belly, a great num- 
ber of white veffels are vifible, fig. 1v. gy. The 
like are difcernable in the back and breaft. 
The skin of the abdomen is made like the ends 
of our fingers, confifting of {mall grooves, but 
this {tru€ture does not hold through the whole, 
and not at all at the extremities of the abdo- 
men; for there, as well asin the whole body, 
it is fomewhat firm, like clear parchment, and 
when roughly prefied, it makes a noife and 
breaks. 
Whe anatomy of the I NGP EB RN A Ee PeAGR Ts, 
a O obtain a perfec knowledge of all thofe 
parts, which I have hitherto mentioned 
in general, there is no other way but to diflect 
the creature. I fhall therefore now give an 
exact defcription of all the minutie relating to 
the internal parts ; for by this means we fhall 
have a complete idea of the external alfo. 
If we begin the diffection in the upper part 
of the abdomen, and cautioufly open the skin 
there, blood immediately iffues from the 
wound, and this being received into a {mall 
glafs tube, Tab. II. fig. 1. aa, and viewed with 
a powerful microfcope, is feen to confift of 
tranfparent globules, as cows milk: the fame 
has been likewife difcovered in the human 
blood for feveral years; it is found to confift 
of ruddy globules {wimming in a clear liquor. 
It is, however, a matter of doubt, whether 
the blood in its veffels has any globules, for 
when drawn from them it may eafily acquire 
that figure ; this may at leaft be afferted of the 
ruddy part of the blood. I ‘have therefore 
often refolved to put a fmall glafs tube into the 
artery of a dog, and with a microfcope to view 
the flowing blood. For thus, by analogy, it 
miay be poflible to determine with fome cer- 
tainty, whether the human blood, before it is 
taken out of its veflels, contain any globules. 
Tam the more in doubt concerning this mat- 
ter, becaufe there are veffels difcovered in the 
body, which appear much finer than the glo- 
bules themfelves vifible in the blood. By this 
means alfo may be known the true difference 
between the arterial and venal blood ; for in 
the latter only, I have hitherto obferved thefe 
globules, having never examined the former : 
Nor fhall I pofitively affert, that there are ori- 
ginally globules in the Loufe’s blood, for they 
may be eafily formed by the intermixture of 
the blood with the fat, and fome wounded par- 
ticles of the vifcera or bowels, which confit of 
a congeries or heap as it were, of globular 
parts; as I fhall thew in its proper place. 
Wherefore, more time ought to be fpent in 
this anatomy, than I can devote to it at prefent, 
being engaged in many other ftudies. 
Tab. IL. fig. 11. Immediately under the skin 
are certain mufcular fibres, which move the 
annular divifions of the abdomen. I have ob- 
ferved three diftin@ kinds of thefe mutcles, 
fome a little broader a, others narrower J, and a 
third fort with two bodies c. One may fee 
that thefe mufcles extend themfelves from one 
annular divifion to another, and that fome are 
much fhorter than others, This little animal 
is very full of mufcles, particularly at the ex- 
tremities of the abdomen ; fince the motion is 
firongeft in that place, and the refpiratory 
points or orifices for refpiration are placed 
there, by the affiftance of which the Loufe 
takes in the air, and by a manifeft aG& of in- 
{piration and expiration, draws it into the body, 
and again difcharges it. When thefe mufcles 
are drawn from the body, they feem as if they 
confifted of but one fibre, but if they are dried 
upon a thin and clear glafs, and wathed with 
fpirit of wine, which takes off the impure fat 
that adheres to them, their fibres and joints 
appear diftinctly to be made up of globules. 
Under thefe mufcles the fat and the tra- 
chee, or air veflels, come in view; nor could I 
ever hitherto difcover any veftige of a heart 
in this upper part of the abdomen, as is ufual 
in other infects, wherein the heart is always 
placed in the upper part of the abdomen and 
back; but I found clearly by this diffecion, 
that the Loufe otherwife agrees in all its parts 
with other infects, as will hereafter plainly ap- 
pear; therefore I have more diligently fought 
for the heart, but in vain: this may probably 
be owing to its extreme fmallnefs, fince it is 
very difficult to find it in the larger infeGts, as in 
the Horfe-Fly. There is alfo another impedi- 
ment, which is, the ftrong and continual agita- 
tion of the ftomach in this infec, being hardly 
a moment at reft, from which there arifes an 
unavoidable inconvenience in inveftigating the 
heart. 
The 
