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6. The Bm^iofa Cow being vie wed by me, I found the 
Wh itefubfiance thereof to be made up alfo of very fine Glo- 
buls. As lor the Gray colour of the Brain, J have not as yet 
M}y felf been able to obferve any ihmg In it that is particular, 
by reafon of its duskifl^nefs. Now that ihe Curious may be 
affifted CO view the particles of the Brain, I herewith fend alfo 
fomeGlafs-pipes, by me contrived for that piirpofe. A B 
isa hollowGlafs-pipe, A C is of the thicknefs 
5..Fjg. iV; ^ ^^^^^^ horie iiair. Its end from A to D, I 
thrull: into the white of the B^-ain (having firft open'd it with 
a Pen- knife.) and lo the open end B, i apply my mouth, and 
there fuck as ftrongly as I can, and during that fuftion I move 
the pipe by thrufting it inward and drawing it outward, fo 
thit the point A remains ftill moving in the white matter of 
the Brain; By which means I got a little of that part of the 
^f^erhaps it miibcfaid^t Braiu intomy Glafs-pipe, which I view 
the natural texture of the in the manner above- prefcribed in the 
f^mscf ihc Bntin, by behg a^count of blood. But this I fliall alfo 
jorcea into thefefmaii pipes, , ^ . . ^ 
ts much attend aMtUted, obferve agaiu at my next conveniency "^. 
7. As to the Marronv of the Back- bone, I found that alfo to 
confift of very fubtil Globuls ; yet fome few Globuls Jlood out, 
of a bigger fize: Whence I doubted , w^hether thefe bigger 
Globuls might not be caufedby the labor of my fuflion and 
motion, having ufed the fame way in viewing this Marrow, as 
I did in obferving the Brain. 
' S. Having divers times obferved the F/<^ of aCow,Ifound 
it to confift of very flender filaments, lying one by the other 
as if moven into a'film. I have alfo viewed feveral filaments, 
wliich were befet with Globuls. Thefe Globuls I judged to 
be blood, and that, pricking our body with a pin without 
hitting a Vein , the bloody Globuls did iffiie from between 
tlaefe filaments: But this I leave to further confideration. 
lyfcan time I have with a pins point fever'd thefe filaments from 
one another, and found the fingle ones fo fine, that any of them 
feem'd to me fome 25 times thinner and finer than a hair. Ha- 
ving expofed them to my Microfcope, I faw to my won- 
der^ that they were made up ofvery fmall conjoined Globuls, 
which in fmalnefs feem'd to furpafs all the reft. This I took 
notice 
