(seq. 61)
Facsimile
Transcription
27 Lect. 2
That the Force of the Heart is not so considerable as some
have imagined is plain from this Instance, viz. that in a
Child, who soon drops its Navel String, the Cicatriz is then this
& yet it does not bleed; but after Death We see by Injections
that when the Arteries are full, by pushing on with a little
Force, the Navel string will break, which shews, that more
Force is used in Injection, than the natural Force of the Heart.
The Artery is always full of Blood, only the Column of Blood is
sometimes larger & sometimes smaller, as the Heart is in its
Systole & Diastole - The Blood sometimes moving with more
sometimes with less Velocity, but is always in Motion, it runs
with the greatest rapidity near to the Heart (because these
small Branches all taken together, are larger than the Trunk, as
has been said) for the same Reason, that a River at a narrow
Part is very rapid, but where wider runs more slowly - This also exp-
lains, why an Artery near the Heart bleeds with Interruption, but
in small Arteries in a continual Stream, only sometimes quicker
& sometimes slower - In an Aneurism, it moves more slowly in
the large Part, than in the smaller, where the Motion of the Blood
is examined with Glasses, it appears to move faster than it real-
ly does, as the Space, which it passes thro' is magnified by the
Glasses - Keil computing the Celerity of the Blood, as to [?] the Time
it takes in moving thro' an Inch of large Artery to be to the Time
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