450 MEMOIRS^/ the 
vations M. Lee-ivenhoek fpent about two minutes ; fo that now 
it plainly appears to the naked eye, that the ftagnated blood can- 
not only be made to move again by the motion of the heart, 
which we call the beating of the pulfe, but alfo that the coagu- 
lated red globules are again diflblved, and aflume their firft 
figure; and therefore there is reafon to conclude that the coagu- 
lated blood in any animal, occafioned by a blow or bruife, can in 
a few days be made to move again, it being taken for granted, 
that the heart of a man pufhes out the blood 7 5 times in one mi- 
nute, which is 4500 times in one hour, and loSoco times in the 
fpace of a day and night: Now finding that in 14 days time the 
coagulated blood feemcd to vanifh, and alfo confidering that in 
this time the heart performs its puliation loScooo times, and that 
in each motion into leveralvefTels together, there has been loolen'd 
and let a-going the quantityof a grainof fand, how much more may 
be fet a-going in the time beforementioned iM. Lee'voenhoek could 
lee in the blood-veflel abovementioned at each impulfe, the blood 
received from the heart 5 now if we fuppofe that the quantity of 
a cubic inch of coagulated blood occafioned by a blow, is too 
much, and that feldom ib much is coagulated at once, then we 
may eafily underftand that fuch coagulated blood, by means of fo 
many motions as are abovementioned, may be loofened, and its 
motion reftored again, if not in all, yet in mod of the veflels. 
At another time M. Leemcenhoek laid one of thefe tadpoles on 
a piece of clean paper, for a little while before he came to look 
\ipon it, a fmall part of the tail came to be wounded, the fkin 
being dry ftuck to the paper, fo that out of an artery, in the 
excoriated part, which M. Lee'wenhoek judged to be fo large 
that four red globules of the blood could pals through it at once, 
there flowed Ibme blood, which 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 fmall branch of a vein, wherein the circulation of the blood did 
flill remain, as if the artery had not been broken. Fig. 19. 
T V reprefents the artery wounded a little above V5 V X lliews 
the extravafated blood ^ V W the fmall artery, wherein the blood 
retained its full courfe, altho' it was fo near the vein T V, out 
of which the blood flowed and was extravafated ^ this at firft 
feem'd ftrange to M. Lee'uoenhoek'^ but upon obferving that the 
blood-veflel V W was united at W to a large blood-veffel that 
conveyed the blood to the heart, then this blood out of V W was 
carried on with fb great fwiftnels, as if impelled from T to V; 
nay, in fuch a manner, that M. Lee'vcenJjoek imagined, that if 
the 
