64 
fure to appear of a golden brightnefs. After 
this, they grow narrower towatds the third 
ting, where we may plainly perceive, through 
the infect’s clear skin, that after acquiring a 
filver whitenefs, like mother of pearl, they unite 
with the branches of-the trachea, ferving as 
laryhxes. © One great advantage the infect 
draws from thefe openings, being placed fore- 
wards, near the beginning of the third ring, is, 
that when it draws in its head and legs, as it 
burrows in the moift cheefe, thefe larynxes are 
covered by the folding of the skin. A contri- 
vance worthy of its great Author, the fole 
fountain of every thing good and wonderful. 
Within the third ring there plainly appears, 
through the tranfparent skin, the two great 
branches of. the wind+pipe, which communi- 
cate about the beginning of the fourth ring, by 
a very confpicuous anaftomofis or inofculation, 
There are alfo many other fmaller branches of 
the trachea ifluing from the two great branches, 
which are placed within the third ring; and 
thefe fmall branches afcend towards the fecond 
ring, and toward the head. I have omitted 
theie ramifications in the drawing, for fear of 
rendering it ‘confufed. There appear befides, 
tho’ fomewhat obfcurely, fome other internal 
parts, through thefe rings. In the fourth ring 
there are feen two more branches of the tra- 
chea, iffuing on each fide of the breaft from: 
the two main trunks ec. Of the two {mall 
branches laft mentioned, one goes to the 
fourth, and the other to the fifth ring, where 
“they join the branches {pringing from the tra- 
chea in this place by a double inofculation, or 
anaftomofis, that. is eafily difcernible. 
I do not find, that the greater branches of 
the wind-pipe form a mutual inof{culation, or 
anaftomofis with each other, any where, ex- 
cept about the beginning of the fourth ring ; 
but the fmaller branches arifing from the fides 
of the greater, and which appear very diftinctly 
on each fide of the body extended all over 
the annular divifions, communicate with each 
other in a very obvious and confpicuous man- 
ner. This may be beft feen on the declivity of 
the breaft and belly, above the borders vifible 
in thofe places, as alfo in the rings of the left 
fide, marked in the figure with the numbers 
The -B’OcO'K: of NAT U RES or, 
ib, Osteo, TOs lae 12, and ther letvers,, Paws 
XLII. Fig. tr. ddd, &c.. There appear, ‘be- 
fides many other, fmaller branches in the fame 
places, which {pring from the greater, and ex- 
tend to the vifcera within. 
All the other rings, from the fifth to the 
eleventh, are conftructed alike; and the rami- 
fications of the pulmonary tubes, which fhew 
themfelves thro’ thefe rings, are nearly of the 
fame form: the principal difference, and that 
too is only accidental, as it is called, is, that the 
other internal parts of the Worm fhew them- 
felves a great deal more plainly thro’ fome of 
the rings, than they do thro’ others. In the 
fifth ring fome particles of fat may be dif- 
cerned thro’ the skin e, and fome more, tho’ 
very faintly, in the fixth. In the feventh and 
eighth, I could perceive fome of the cxca, or 
blind guts, or clofed inteftines ff. ‘Thefe, on 
account of their contents, appear of a very pale 
colour, in fome degree approaching to green; 
the fame alfo I could fometimes perceive, pretty 
diftinAly, thro’ the ninth ring, tho’ at other 
times very little or not at all. In the tenth 
ting, and between the principal trunks or 
branches of the wind-pipe, which extend 
themfelves along the back of the Worm from 
one end of its body to another, there gene- 
rally appears a confiderable branch of the tra- 
chea g, running to the internal parts. In the 
eleventh ring, there is feen a-very remarkable 
particle of fat 4, refting upon two branches of 
the wind-pipe ; but it has been only in fome 
Worms that I could perceive this: it is not 
univerfal. 
The twelfth ring differs in conftruction from 
all the others; for the two greater branches of 
the trachea terminate there, projecting at their 
extremities in the fame manner as the leffer 
branches of the trachea do beyond the fur- 
face of the body. The projecting parts are, 
like the other breathing holes near the head : 
they are of a pale colour, but formed in a dif- 
ferent manner, as may be feen by looking over 
the figure. 
To conclude: the furface of this twelfth 
ring, is covered with a variety of prominent 
tubercles, and little cavities like wrinkles ; the 
ufe of which I fhall hereafter defcribe. 
Of the difpofition of the Mite. 
HUS, Sir, I have defcribed, in a few 
words, the external parts of this Worm, 
and fuch of the internal ones as appear thro’ 
its tranfparent skin. But all thefe particulars 
will appear of little confequence, when com- 
pared with the wonderful contrivance’ that is 
feen in every part, when more minutely ex- 
amined: fuch a contrivance,as the great Archi- 
tect of nature alone can thoroughly underftand, 
or could form; the moft ingenious inventions 
of man being, in comparifon with it, lame and 
defective. 
The figure I here give of this Worm, which 
is furprifingly ftrong; and has a moft vigorous 
conftitution, reprefents it lying on its back, and 
{eizing its tail with its teeth or claws; but this 
pofture is not, as you may guefs, the natural 
condition of this Worm, nor is it ever found 
lying on its back, when alive ; fo that my only 
defign in giving it thus, is to be better able to 
explain the manner of its leaping, in the moft 
fatisfactory terms. By turning the figure, you 
will have a moft exact and natural reprefenta- 
tion of the little infect, preparing to make a 
{pring. 
When this creature intends to take a leap, 
it firft ereéts itfelf upon its anus; in doing 
which, it is greatly affifted by the prominent 
4 tubercles 
