The 
avery irregular form. When this fat of the 
Coflus is further examined, with the help of a 
powerful microfcope, it appears of an un{potted 
whitenefs, and is covered or furrounded with 
tranfparent little bubbles, almoft like bladders : 
it is contained or enclofed in little membranes, 
and is a real oil or fluid fat; and hence there- 
fore if thefe membranes be wounded a little 
with the point of a very fine needle, it eafily 
flows out, and a drop of it then falling into 
water, {wims on the furface like other fat. 
Whilft this fluid fat, difcharged in this manner, 
and the white membranous particles are break- 
ing, the object in general is thereby darkened, 
and the water becomes muddy, as if there was 
ftarch, lime, or chalk mixed with it; becaufe 
the fat then divides itfelf into many little par- 
ticles : but it is more beautiful to fee this in the 
Nymph than in the Worm. The fat of larger 
animals, viewed with a microfcepe, is likewife 
obferved to confift of very minute particles ; 
which, becaufe they are white, one would fay 
are like grains of fand ; however, they are not 
fo tranfparent, and all of them feem to be 
almoft of the fame fize, which is not the cafe 
with refpect to fand. Therefore the globule 
compofed of fat ought not to be confidered 
otherwife than as a mafs of little grains of fand 
faftened together, though every particle of fat 
is contained in its diftinét membrane, all which 
break in pieces and fall to the bottom, when 
the fat is melted. In the firft rudiments of 
calves and fheep, in the wombs of their patent, 
thefe {mall particles of fat appear even to the 
naked eye, without a microfcope ; for as there 
are not a great quantity of them there, they may 
be the more diftinéily obferved. 
To proceed: as therefore the fat hinders 
much the view of the internal parts, this im- 
pediment is increafed by the addition of the pul- 
monary tubes or pipes, for they are diftributed 
through the Worm, in eighteen principal 
branches,.in fo different and beautiful a manner 
as cannot be exprefled by words, Thefe branches 
proceeding from the points of refpiration, are af- 
terwards divided into innumerable little {prouts 
and fhoots; fo that there is no part in the 
Worm, to which fome of thefe air-pipes or their 
ramifications are not extended. They are con- 
veyed even to the mufcles, to the brain, to the 
nerves, whofe moft minute divifions are likewife 
provided with their air-pipes. Wherefore this 
Worm, as well as the other {pecies of infects, 
feem indeed to be fuftained much more by the 
power of a fubtile air, than the larger animals 
and thofe which moft abound with blood: un- 
lefs one fhould be inclined to think that the air 
is mixed with the blood, by means of the circu- 
lation, and with this is carried through the ar- 
teries to all parts of the body, which opinion is 
indeed not very improbable, All the pulmona- 
ry pipes in the Worm are ftraight, and have on 
bladders, for only the perfect Beetle has them. 
We {hall now leave the confiderations of 
thefe pipes, and explain more accurately the 
other parts. The firft of them that offers in 
His VOR Y & TH OL Get 8. 
137 
our diffection is the ftomach ; which is indeed 
feen moft diftinétly, when the Worm’s skin is 
entirely opened, Tab. XXVII. fig. x1. and xit. 
aaaa, It then appears that almof the whole 
body of the Worm is poflefied by this part. 
It confifts of feveral coats, and has moving cir- 
cular fibres, whereby its contents are agitated. 
It is always, except when it caits its skin, found 
diftended and full of chewed wood, or the like 
fubftances, amongft which the creature lives ; 
and this is the reafon that it appears bluith, or 
fometimes reddith, its contents being eafily feen 
through its coats. ‘This ftomach is very narrow 
at its origin, at the mouth; whence it forms the 
gullet; but it is a little after expanded until 
it makes its upper orifice called the cefophagus. 
In that part the ftomach c is on the infide in 
front armed with about feventylittle tooth-like 
parts dd, whereof fome are longer than others. 
Thefe are divided into fix orders, whereof the 
two upper ones, 1,2, look forward with their 
points, but the other four, 3, 4, 5,6, which are 
confpicuous toward the lower parts of the fto- 
mach, have their ends directed partly to the 
fore e and partly to the hinder f parts. All thefe 
open into theftomach, in the fame manner as the 
appendages in fifhes open into the inteftine next 
to the ftomach. But I fhall not take upon me to 
affirm that one of thefe tubes is inferted into ano- 
ther, as is the cafe in the Whiting. I only would 
fay, that each tube feparately opens in the fame 
manner as may be feen in the Salmon, in which 
the pancreas opens into an ecphyfis with above 
fixty peculiar and diftinét tubes. A little lower 
the ftomach is rendered confpicuous by twenty- 
two whitith glandular tubes, Tab. X XVII. fig. 
XI. XII. g, whofe ends are turned towards the 
hinder parts. Finally, about the lower part bof 
the ftomach, a little above the beginning of 
the pylorus, are likewife obferved thirty fuch _ 
tubes 27, which are alfo uneven, and fome 
fhorter than others; thefe are there fituated 
obliquely and run inward ; thefe alfo open into 
the ftomach there, and their ends point forward. 
If the middle feries of the tubes before defcrib- 
ed are broken off from, or taken out of, the 
{tomach, they refemble the crown of a trepan. 
On the other fide, where the ftomach lies in 
the belly of the Worm, and the tubes are dj- 
rected towards the hinder parts, a future like 
the ridge of the peritoneum divides it vine Ste 
are infinite pulmonary fibres alfo inferted in the 
ftomach: on each fide of the ftomach are like- 
wife placed fome {mall veflels £4 & &, difpofed in 
a very regular and beautiful manner, which I 
call the vafcula varicofa & crocea, the {wollen 
and yellow veffels, after the example of the 
celebrated Malpighius, who in his excellent 
treatife on the Silkworms, has given that name 
to the like veffels in that infect. Where the 
ftomach terminates about the pylorus, is feen 
a natrow and fhort inteftine 1) which is foon 
dilated 7 into a large, thick, and very capacious, © 
though fhort, gut, and may be properly called 
the colon ; for it is of the fame ftru@ure with 
the colon in the human fpecies, This inteftine 
Na is 
