Of the Circulation of the Blood . £ 
At another time Mr. Leeuwenhoek laid one of thefe 
tadpoles upon a piece of white paper, a little while be¬ 
fore he came to look upon it. A fmall part of the tail 
was wounded by the fkin flicking to the paper ; fo that 
out of an artery in the excoriated part, fo large that 
about four red globules of the blood might pafs through 
it at once, there flowed fome blood that remained without 
motion about the wounded part, yet that whereon his 
eye was fixed, not being half a hair’s breadth from the 
excoriated artery, there proceeded a branch of a vein, 
wherein the circulation of the blood did ftill remain, as 
if the artery had not been broken, fig. 37. TV, exhi¬ 
bits the artery wounded a little above V. V X fhews 
the extravafated blood. V W, the fmall artery wherein 
the blood retain’d its full courfe, although it was fo near 
the artery T V, out of which the blood flowed ; which 
at firft feemed very flrange, but obferving that the blood- 
veflel V W was united at W to a large blood-veflel, 
that conveyed the blood to the heart, the blood out of 
V W was continued as fwift as if it had been impelled 
from T to V, in fuch a manner that Mr. Leeuwen¬ 
hoek imagined, the vein at V had not been united with 
T, but had lain with its aperture at V, in the extra¬ 
vafated blood ; fo that the extravafated blr'd was onlv 
* J 
for a little fucked up and conveyed through it. He 
then faw a vein wherein the motion of the blood feemed 
very uncommon, as at fig. 38. whereof a b reprefents 
an artery, whereby the blood is impelled with great ve¬ 
locity from a to b, then b c, whereby the blood is con¬ 
veyed towards the heart, muft be called a vein, clofe by 
which lies another artery dee, wherein the blood is 
conveyed from the heart from d to c; now if the vein 
b c be united with the artery d e, as is feen at c, and 
the blood be thus conveyed from c to e, be fiiould be 
called 
