O14. 
ing their thicknefs I could not eafily divide 
them. Some of thefe fibres are laid over 
others, ‘Tab. XX. fig. 1v. 0, in the fame man- 
ner as they are wont here atAmfterdam to pack 
beams or pieces of timber on board of {hips 
to be exported; that is, they were here and 
and there feparated from each other, and {paces 
were left between them ; and by this means 
was exhibited an object, like the courfe of the 
mufcular fibres in the papille of the kidneys. 
Thefe things appear more beautifully when 
the diffection of the eye is begun in the lower 
part, as may be feen fig. v. under the letters 
¢7 9, which reprefent the fame fibres. Of what 
nature thefe fibres are, and whether they com- 
municate with the brain ss, I have very 
anxioufly inveftigated, and, if I am not 
miftaken, I have found that they are joined 
to the brain, nay, they are of the fame colour 
with the brain, that is, fomewhat grayifh in 
part, and elfewhere freth coloured : hence I 
call them the cortical fibres, becaufe they are 
like the cortical fubftance of the brain. In the 
Wray-fith, there is feen a very remarkable 
nerve, iffuing out of the brain, and terminat- 
ing in a large inflated extremity. ‘This is con- 
veyed towards the bone of the head, and 
is there admirably divided on each fide into 
many filaments, to which thofe fibres in the 
Bee’s head likewife anfwer, and it may in 
fome meafure be likened ; though thefe nerves 
in the Wray-fith do not all feem to contribute 
to the fenfe of feeing, but rather to that of 
hearing or fmelling: this matter therefore full 
remains to be inquired into, 
Between thefe fibres is feen the cortical 
fubftance of the brain, the nature of which 
thefe fibres do not feem to be unlike. It is 
manifeft that this fubftance s s, as well as the 
matter of the fibres gg, remarkably commu- 
nicate with the brain, indeed that they both 
rife out of it. 
The brain of Bees confifts of four pair of 
diftin@tly confpicuous parts, to which, as a 
Aifth may be added, namely, the fpinal marrow 
within the skull, or the principle or origin of 
thefe little parts 7; nor can I befides thefe find 
any others in this infect, not even the fo famous 
pineal gland *. The two foremoft of thefe 
little parts, fig. vi.-c, are fomewhat globular 
or pyriform, and emit two nerves on each 
fide, which are divided again into two parts d d, 
but their courfe, or the way they are {ent off, 
is ftill a fecret to me. The other three pair of 
little parts I have not yet fo plainly difcovered, 
as the firft here defcribed, becaufe they com- 
municate and are connected with the three 
particular little eyes before mentioned, which 
are placed in a triangular form, fig. 1. between 
the larger eyes here explained, and divided in 
the manner juft laid down, though I could not 
* The Bees have probably all that delicacy of {mell, 
fumes by their fondnefs, and ftinks by their averfion : 
and ftink are not the fame with ours. 
fmell more offen 
would iting any 
the real hiftory 9 
The BOOK of NATURE; or, 
fo diftin@tly as I could have wifhed explain 
the method whereby this connexion and com- 
munication are performed. The firft thing 
that I have obferved diftin@ly with regard to 
thefe little eyes, is that they alfo have pellucid 
cornea 3 and fecondly, that in their cavity there 
likewife appears a coloured little part, which 
may be called the uvea. But of what nature 
this fubftance, which is under the uvea, is, and 
whether it likewife confifts of numerous fibres, 
or is itfelf a fingle fibre, I cannot determine, 
though it feems to me to be a continued fub- 
ftance. Thirdly, below this we fee thofe three 
pair of little parts, which are as it were enclofed 
within it: thefe are the reafons why I call 
thefe parts eyes. To which may be added, that 
the eyes of Spiders and Scorpions are exter- 
nally formed exactly in the fame manner, and 
are {mooth, glittering, and without divifions, 
and they are difperfed as thofe that are difpofed 
at random over the body. The Wolf Spider, 
which catches its prey by leaping on it, and 
not by means of webs, has its eyes placed in 
the fame manner, But this fpecies has a very 
exquifite and incredible fharp fight, compared 
with other Spiders, which feem almoft blind 
and, as it were, deftitute of motion, that they 
may catch their prey, if any falls into their 
{nare, with greater certainty. I have not yet 
difcovered the internal ftructure of thefe three 
eyes of the Bee. The letter 4, fig. vr. likewife 
fhews the brain, or rather one pair of thofe 
parts of the brain. We have before defcribed 
and explained by what means the cortical 
fubftance of the brain, is fhewn when the fibres 
are taken from it. The letters ee feverally 
fhew the third and fourth pair of little parts, 
or the cerebellum, and alfo the manner where- 
in thefe parts communicate with each other. 
The cortical fibres, fig. 1v. 2% that iffue from 
thefe, are reprefented in their fituation in the 
fourth figure. In order to obferve the principle 
or beginning of the fpinal marrow, fig. v. r, 
it is neceflary to begin the diffection of the eye 
at the loweft part, or where the head is joined 
to the thorax. But then if you only remove 
the horny head, you will immediately fee the 
fat, and the originations of the pulmonary 
tubes, which are here very numerous, and 
the larger branches of which are diftributed 
towards the upper parts; but the fmaller are 
connected with the fat, in the fame manner as 
the fcapus or ftalk of a bunch of grapes is 
with its berries, and hence is produced a moft 
agreeable fight: one or two membranes alfo 
muft be there feparated from the brain, before 
the marrow comes in fight. But then one may 
fee there very beautifully that other {pecies of 
the fibres of the eye, Tab. XX. fig. v. gg, 
which I have called the cortical fibres, and 
reprefented under the letters fg. 1v. an, in 
for which they are celebrated; but it is not true that they diftinguifh per- 
certain {mells excite and others offend them; but their notions of {weet 
They are fond of places where urine ftands to putrefy, than which there is fcarce any 
five. It had been faid they would fly in fondnefs toa man who had a nofegay of fweets about him, and that they 
who carried ftinks; but Mr. Reaumur made the experiment and found it falfe. There are wonders enough in 
f thefe animals; ’tis wrong to difgrace them with falfe and fittitious tales to make all fufpected. ; 
the 
