I 445^ ] 
Yet in.tha^t Wood vefiel M ckqulation was fo 
fwift, as in any other veffels. .L was fully fferfwaded 
formerly, that if one doth fall, or is beaten or bruifed, 
that in fuch a cafe the blue fpots that do appear was 
'nothing elfe but blood that was ftopt, or did ftagnate, 
and that this coagulated blood, before it beginneth to 
corrupt, was driven out thorough the skin, with the 
- fweat^ but by the following obfervation, I came to 
be of another opinion. 
f v Now the blood by R. being thus without the leaft 
motion, it was by every pulfation of the heart impel- 
led upwards from N to P, and in every moment of 
time, that it was puflied upwards, it came alfo back 
again, in fuch a manner as if we faw before our na- 
ked eyes, a very quick motion of a Saw that went 
.backwards and forwards. 
So as we know that if we ufe never fo great vio- 
lence in preffingof water, yet we cannot prefs it clofer 
together than it was before, the blood now being im- 
pelled forwards through the heart, cannot be com- 
prefled into a lefs place. 
This being fo, we muft conclude, that the tunic of 
the blood veffel between N and P, and alfo fomewhat 
below N, is diftended in widenefs by every pulfation 
of the heart 5 and as quickly as this uncommon di- 
itenfion is performed, fo quickly doth alfo the tunic 
of the veffel (brink up again, whereby the blood that 
was thus puftit forth, is drove and forced to run back 
again. . 
Looking upon this attentively, I faw that the blood 
after a little time, and that the longer the more, from 
J? to R, did begin to come into motion, after fuch a 
manner,. . as to be pufli*d back again, and I alfo did 
judge that the blood veffel marked with N^ O was du- 
ring my obfervation a little more extended j and by 
A a a a 2 * con* 
