( 12C-8 ) 
Veins and Arteries thcmfelves, the more becaufe that 
the Arteries are conveyed into the Membrane only by the 
very final! Branches : Yet it happened to me once, that I 
cut a Slice of the Spleen at the thinned end of it, one 
part of which remain’d fastened to the laid Spleen.in which 
I obferved an Artery, wi h feveralof its Branches, lying 
acrofs the faid fibrous Part, without being joyned to it, 
only the extream Parts dr Branches thereof, as far as I 
cold djfcover, infinuated thcmlelves into the Membrane. 
Now that this was really an Artery, and no Vein, 1 was 
fully fatisfied, partly becaufe the Tunick or Coat thereof 
was very thick, and partly that it was a Blood Veflel, 
becaufe the Cavity where it was cut off appeared very 
plain to me, which I could trace almolt through the 
whole length of it 5 befides I imagine that the Veins, by 
reafon of the thinneft of their Tunicks, could not under- 
go fo many Motions or Poflures as I was obliged to put 
them into, in order to expofe the Fibrous Parts plainly 
to the fight. 
Thus far had I brought my Obfervations, which I had 
made only in order to review them at any time, but being 
informed that a certain Gentleman having writ fomething 
about the Spleen of a Man, had amongft other things 
affirm’d, that the faid Spleen was not compos’d of Parti- 
cles of Flefli j and moreover, i having been very free in 
delivering my Thoughts about the Contexture and Mo- 
tion of - the Spleen, I thought fit to place a fmall Particle, 
(as 1 had prepared it) of the Spleen of a Lamb that was 
about a year old before a Microfcope, and to caufe a 
little pfft of it to be Painted, concluding that the Spleen 
of a Man, an Ox, or a Sheep, are of much the fame Na- 
ture one with another, though perhaps their Figure either 
in length or thicknefs is fomething different , thus decla- 
ring that 1 fhall not depend upon the Difcoveries of any 
other Perfen. 
Fig. 
