4.8 The BO O'FK? of Ni ACT U R ES of; 
found in it, on diffection, little red ftones, and 
{mali grains of fand intermixed: I am not able 
to explain, on account of the narrowneds of this 
infect’s mouth, how it could poffibly take in fuch 
large and hard fubftances. This induces me to 
think, that it only fucks in the fubtile vifcous par- 
ticles of earth, mud, and clay, which afterwards 
undergo various mutations in the ftomach, as I 
fhall hereafter endeavour to fhew, in the anato- 
my of this Worm, and the Nymph produced 
by it, where I fhall alfo relate the manner how 
the very inteftines of this infect caft their fkins. 
I have tried many methods of killing thefe 
Worms, in order to examine them anatomically, 
Spirit of wine does not fo well anfwer this pur- 
pofe; for they live in it a day and night, or per- 
haps longer; but I cannot affirm any thing pofi- 
tively on this head, as I grew tired of wafting 
my time, that I could otherwife fo well employ, 
in watching them. Some of them that I threw 
into rain water, after taking them out of the {pi- 
ritof wine, together with others, continued alive 
feveral days, till I had opened them all, while 
living, in order to view their parts, and found 
myfelf under a neceffity of looking out for a frefh 
fupply. In vinegar alfo thefe infects held out a 
Jong time, and they moved more brifkly in it, 
than in water; they would fometimes alfo crawl 
CHA 
out of it. Some of them endured this trial for 
two days and a night, and fome a longer time, 
whilft others expired fooner. But hardy as their 
conftitution may be, they die in fpirit of tur- 
pentine in lefs than a quarter of an hour. It 
is very curious to obferve, at this time, how the 
air contained in them remains, in appearance, 
fixed between their hairs, and the divifions of their 
body, fo as perfectly to imitate the appearance, 
as it were, of tran{parent filver. 
The induftrious Goedaert, as far as Ican guefs 
by his drawings, give us one of this Worm ; as 
alfo a defcription of it in the firft part, and fe- 
ventieth experiment of his natural metamorpho- 
fis; but he forgets to tell us whether it belongs 
to land or water: nor is there among all his ob- 
fervations concerning it, any thing remarkable, 
except its being able to live for nine months with- 
out food. On this account he calls it the Chame- 
leon, impofed upon by the vulgar opinions of 
the land-animal of that name, living entirely 
upon air. 
We have likewife, in the learned Aldrovan. 
dus, a figure and a defcription of this Worm, 
under the name of. the Water Inteftine. But 
this author knew nothing of its changing to a 
Fly, or of the other furprifing particularities, 
which I have obferved in it, 
Pe lik 
The anatomy of this Worm, giving an account of its teeth, ftomach, inteflines, [a- 
lival veffels, pulmonary tubes, fat, heart, brain and mujcles. 
HE internal parts of the Worm, which pro- 
duces the Afilus or Gad-fly, are the teeth, 
gullet, ftomach, thick and flender inteftines, fa- . 
lival veflels, pulmonary tubes, fat, heart, brain, 
{pinal marrow, nerves and mutfcles; each of which 
I thall now feparately defcribe. ‘The teeth are 
feated in the back part of the mouth, as in many 
fithes, fo as to enable the infe@, after it has 
taken in any food, to grind it properly before it gets 
down into the ftomach. I have by me {peci- 
mens of Hermit-fifh, and large Crabs, which 
have teeth in the very cavity of the ftomach. 
The teeth of the infect now under confidera- 
tion, are of a fubftance between bone and horn, 
and their furface is in many places rough and 
unequal; but thefe afperites are not confiderable 
enough to be taken notice of in the figure. The 
gullet is a very flender channel, running from 
the jaws and mouth to the ftomach, through 
a fiffure or opening in the fpinal marrow, con- 
trived on purpofe to give it free paflage: this 
is likewife the cafe in many other infe&ts. For 
this reafon, the brain of this Worm lies, as it 
were, upon the fore-region of the ftomach. The 
ftomach itfelf appears as a {mall membranaceous 
particle, and is found full of the half-digefted 
food, on killing the Worm, in fpirit of turpen- 
tine, as foon as it is caught, and then diflecting 
it, "The flender inteftines alfo appear, on this oc- 
cafion, filled with the fame fubftance. In this 
{pecies of Worms, the ftomach and flender in- 
teftines are about five Dutch inches in length ; or 
to ufe Mr. Thevenot’s method, they are equal 
to five rows of regular cells of Bees, built one 
againft another, five in arow. Mr, Thevenot 
imagined, that by means of fuch cells, an uni- 
verfal meafure for all nations might be difcovered, 
fappofing fuch cells were every where equally 
regular, and of an equal bignefs. I muft here 
obferve, that there is very little difference 
between the ftomach and inteitines of this in- 
fect. : 
Towards the extremity of the flender intef- 
tines are four vafcula varicofa, or ceca, or little 
guts or appendages clofed at the end: thefe are 
fituated equally in the abdomen and thorax, 
which fometimes contain an aqueous fluid, and 
fometimes a bright white fubftance, like coagu- 
lated milk or new cheefe, when beginning to 
crumble to peices. Thefe four little inteftines 
are full twice as long asthe real guts of the crea- 
ture, and they form a great many uncommon 
turnings and windings in the thorax and abdo- 
men, fo that it requires no {mall pains and at- 
tention to difcover and feparate them. In the 
next place are the large inteftines, which here 
and there {well out into nodules, as it were, and 
are filled with clay, red particles of ftone, grains 
of fand of different fizes, and other fimilar fub- 
ftances, All thefe particulars will appear to 
greater advantage in the figare which I propofe 
to give of the Nymph’s inteftines, accompanied 
with 
