( >38 ) 
been left in thofe Apertures, was evaporated, I could 
fee them very plain and diftind. 
Now fince of late there have been two Perfons 
of note, who have maintain’d, that the Blood circu- 
lated thro’ the carnous Fibres } in order to examine 
into the Truth of this Hypothecs, 1 prick’d my 
Thumb with a fine Needle, and placed a little Blood 
upon the Glafs, where the carnous Fibres lay, with 
defign to obferve with my Microfcope, what was 
the proportion between the Diameters of a Globule 
of Blood, and of the abovefaid Apertures, which 
1 had feen in a Fibre. 
While I was employ’d in thefe Obfervations, in 
came my Painter, who for thefe many Years has 
drawn all myDifcoveries,and not being willing totruft 
too much to my own Eyes, he being much younger 
and better lighted than 1, I placed before him the 
fmall Apertures in the Fibres, which he faid were 
plain enough to be feen, and when he had view’d 
them to his fatisfadion, 1 placed before him likewife 
the Globules of Blood, which lay together in great 
numbers, and yet fo diftind and feparate one from 
another, as one lhall feldom fee them. I then ask’d 
him, what he thought to be the proportion between the 
Diameter of a Globule of Blood, and the Diameter 
of one of thofe Apertures in a flelhy Fibre. After 
a little paufe, he gave me for anfwer, that the Dia- 
meter of a Blood- Globule, was four times as large 
as the Diameter of one of thofe Apertures. If fo, 
then according to the known Rule, a Globule of 
Blood muft be divided into 64 parts, before it can 
enter through one of thefe Apertures into a flefhy 
Fibre. 
This 
