C 448 ] 
The firft obfervation of the motion of the blood 
that came before me, was a fmall Veffel, that-was a- 
little thicker, than that a red globule of the blood 
could go through it, wMch is mar^d in Fig,, V with 
A andB. v- .\. • , 
This veflel, which is called an Artery, through 
which the blood coming from the heart from A to B 
is impelled with great fwiftnefs, divideth itfelfat B 
into tv/o branches, which is marked with B C and 
BE- 
Thefe two mentioned branches united themfelves 
again in D, where they remained but for a little fpace 
united, as is ftiewn by DF, and from this veffel did 
divide again into two branches, F G and F L 
Thefe two branches run crooked, and were united 
again at H- where they made againfbmewhat* a bigger 
veffel, as you fee by H K, where atK it did unite again 
into a bigger Veflel. 
This being thus ^ we ; miaft caU thefe Bl ood veflels 
A B G D F and ABE F I Arteries, tecanfe they 
carry the blood from the heart firft in G and 1: and 
the blood veffels G H K and I H K we muft icall 
veins, becaufe they carry the blood to the heart agaim 
In anoth^-place I faw the blood tun iti an artery 
that ^yas fo'big, that about twenty oi^f thefe red-glor 
bulfes cduld tun together at one ttoe through iti - - 
This was a great artery, iii corn|parff6n to thefe her^ 
before mentioned, and in this the blood is carried ve- 
ry flowly^ a fmail portion whereof is delineated in 
F^g; 2k at L Mi but of this blood voflet came a- left 
one, as you may (ee at M CX - ':i:;:i v/ nfc ii : eno 
Now had the blood, in the velftrfrom L td^M; - iiot 
fo quick a motion as it had in others, becaufe the blood 
in the veffel at R did in a manner ftagnatej -infdriiuch 
that one could difoern no feparated parts in the btood, 
for it did appear there to be but one even red coloun 
