Ties EA Se RO Rayne Nuvo BOTs: 177 
is fent out ; fo that thefe veffels may be confi- 
dered as the parts out of which the Worm 
draws its threads.) When the Worm, having 
taken fufficient nourifhment is foon afterwards 
to be changed intoa Nymph, then by the help 
of thefe little threads it covers in its little cell, 
and at the bottom, and on the fides within, 
covers it over as it were with glue. I have feen 
in fome Worms likewife, that thefe tubes, not 
far from the part where they iffue forth under 
the mouth, have divided themfelves into two 
branches, which, however, as I have already 
mentioned, I have not as yet been able to trace 
further. In the mean time I believe, that they 
end in the clofed appendages, as is the cafe in 
filkworms. Whenever thefe tubes are pierced 
through tne middle, in that part where. they 
meet in one little body, there iffues thence a 
glutinous matter extremely tough, and capable 
of being drawn out into long threads. The 
fame thing is alfo obferved in the glue of Silk- 
worms, not yet drawn out into threads, and" 
other infects, and even in fpiders themfelves. 
This, however, is to be obferved only in thofe 
Worms that are near the time of their tranf- 
mutation into Nymphs. 
I have not perceived any other parts in the 
' Worm, befides thofe I have already explained, 
fince the vefiels in it, which carry and return 
the blood, are fo very delicate and tranfparent, 
that I was not able to difcern them. For the 
fame reafon I could not defcry thefe very 
parts even in the Coffus, though there are in- 
ventions of art, by the affiftance of which we 
may come to.the knowledge of them. In Silk- 
worms I fucceeded by the following method, 
which I have reprefented in the fourth figure, 
viz. I provide myfelf with a little glafs tube, 
fuch as is here delineated, which I take care 
to have made like a vial in the middle, Tab. 
XXIV. fig. tv. a, at one end é to be drawn out 
to the utmoft {mallnefs, and at the other end ¢ 
made thicker and broader, in order that the 
air blowing into it, may be conveniently forced 
in at this end: this done, I fill the little pipe 
with fome thin liquor coloured, not however 
of a very penetrating kind, let in through the 
thicker end c, and then with the greateft 
caution perforating the fkin 4, I thruft the 
thinner end into the heart. This may be done 
eafily enough. By thefe means, and then 
gently blowing into it, the heart, and many 
of the veflels fhooting out from it, may be 
filled ; and further, though no other parts are 
difcovered in thefe Worms, ftill it is of ufe 
to take notice in them, both of the pulmonary 
tubes, and the fpinal marrow. As for the mar- 
row, indeed, though by reafon of its exceffive 
yielding and foftnefs, I could not examine it 
with any exactnefs in the Worm, yet I had 
no difficult tafk to difcover it in the male Bee, 
of which when Icome to treat, I thall defcribe 
it as there delineated. 
There are, as I faid, ten points of re{piration 
on each fide of the body, in alltwenty; and 
there is the fame number in Silk-worms, and 
in the Coflus; but there is this remarkable 
difference, that both in the Coffus, and in 
Silk-worms, only eighteen of thefe points 
with reddifh tufts, of a fubftance between 
horn and bone, fuffer themfelves to be difcern- 
ed; but the tenth pair of them is not fepa- 
rated fo plainly, which perhaps is the reafon 
that the incomparable Malpighius does not 
defcribe twenty, but only eighteen of thefe 
points in Silk-worms. The twenty pulmonary 
tubes, which in the Worm of the Bee arife 
as it were from thefe points, are carried in- 
wardly into the body, and have all a mutual 
communication with one another: a kind of 
little tube runs all along from one point to 
another, fo that in this manner the anafto- 
mofis or inofculation of thefe veffels is propa- 
gated through the whole body. The ftructure 
of thefe pulmonary tubes is in truth exceeding 
wonderful, for all of them confift as it were 
of curled rings, which being twifted together 
in the clofeft manner imaginable, and in- 
twined with one another by the fineft fila- 
ments and moft delicate membranes, make 
the union fo completely folid, that the air can 
no where pervade, except through the middle 
cavity, which is always open. Thefe rings 
are alfo twifted clofer in fome of the tubes 
than in others, but indeed the fabric difplays 
the greateft artifice in thofe places, where 
thefe pipes divide into branches and fhoots, 
for there the rings are ranged with furprifing 
fill one clofe to another, and are joined to- 
gether by the intervention of the lengthening, 
abbreviating, and crooked rings. All thefe 
things may be feen very beautifully, if one. 
puts thefe pipes on’a very thin piece of glafs, 
and afterwards views them againft the light: 
this is indeed a.very ufeful contrivance. They 
may alfo, in order to diftinguith them the 
better, be placed on thin, coloured, black, or 
green.glafs. Thefe pulmonary pipes or tubes 
are always open, as I have before mentioned, 
which is likewife the cafe in the human 
{pecies, and in other animals, but principally 
in regard to or about, the cartilaginous rings 
placed in the neck, fo that therefore the air 
in the human body, or any other animal, which 
hath once breathed or refpired, can never be 
entirely driven out of the fubfance of the 
lungs. We muft further obferve, that thefe 
pulmonary tubes are in this Worm diftributed 
in fuch a manner, that the brain, the nerves, 
and even the eyes are furnifhed with branches 
of them; this I thall afterwards thew in the 
anatomy of the eye, the ftruGture of which, 
too delicate for all defcription, proclaims the 
infinite wifdom of the fupreme Architect, 
Next we are to explain the fixth figure in this 
plate, which exhibjts fome of the vifcera of 
this Worm. 
The letters z a, Tab. XXIV. fig. v1. denote 
the ftomach, furnithed with infnite alr=pipes 
dd, which are affixed to it: 4 is the gullet. 
c Exhibits fome glandulous little parts, which 
are feen diftinétly through. the tranfparent 
ZZ ftomach. 
