8 Of the Circulation of the Blood. 
only one Angle globule could pafs through, it at once, 
wherein not the leaft motion, at his firft obferving it, 
could be difcovered, now began to flow; yet the par¬ 
ticles of blood, which at firft pafled through it, were 
but few in number, and confequently far afunder; hence¬ 
forward all the blood from P to R was put into motion, 
as well by being pufhed forward, as by recoiling back 
again, and that at every pulfation of the heart. Mr. 
Leeuwenhoek fpent about two minutes in thefe obferva- 
tions; from whence it plainly appears, that the ftagnant 
blood cannot only be made to move again by the motion 
of the heart, which we call the beating of the pulfe, but 
alfo that the coagulated red globules are again diflolved, 
and afliime their firft figure ; from which we may reafon- 
ably conclude, that the coagulated 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 feventy-five times 
in one minute, which is 4500 in one hour, and 108000 
times in the fpace of a day and night; and finding that 
in 10 days time the coagulated blood feemed to vanijfh, 
and alfo confidering that in this time the heart performs 
1080000 pulfations, and that in each motion, into feveral 
vefiels together, there has been loofened and fet a-going 
the quantity of a grain of fand, how much more will be 
puflied forward in the fame time ? Mr. Leeuwenhoek 
could fee the blood received from the heart at each im- 
pulfe, in the vefiel above-mentioned. If we fuppofe that 
the quantity of a cubic inch of coagulated blood, oc¬ 
cafioned by a blow, is too much, and that feldom fo 
much is coagulated at once, we may eafily conceive, 
that fuch coagulated blood, by means of fo many pro- 
trufions as above-mentioned, may be loofened, and its mo¬ 
tion again reftored, if not in all, yet in moft of the vefiels. 
At 
