(seq. 47)

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20 Lect. 2

those of Trees do not N 13. In the Kidneys, however they do
not anastomose - The largest Anastomosis is in the Basis
of the Skull, made by the two Vertebrals, near the Foramen
Occipitale. Small Branches of Arteries frequently anastom-
ose, the Advantage accruing from this is, that the Blood
is more thouroughly mixed, also an Equilibrium is kept up; if one
Branch is obstructed, it passes thro' another, or if it is too full, goes
to the collateral Branches - The other Advantage is, that when an
Artery is destroyed for a Time, that Part may have its Nourishment
by another, as in the Aneurism, when the great Artery of the Arm is
mortefied divided, the Limb would mortify, were it not for these lateral Com-
munications - There are said to be three Kinds of Arteries [?] Sanguiferous,
Serous, & Lymphatic, according to Leuvenhoek's Doctrine, tho' the
two former might be sufficient, as the last is only Theoretical - We
have now a distinct System under the Name of Lymphatics -
Boerhaave's Error Loci may be understood from hence, & is founded
upon it, i. e. when serous Arteries are distended with red Globules.
The Arteries begin in the Heart, & terminate in the extreme Branc-
hes - 1st The greatest Numbers terminate in Veins. - 2d. Some in
Glands i. e. in secretory Vessels. 3d. Upon Surfaces, as on the spon-
gy Surface of the Penis, where the Arteries open into the spongy
Cells, & we believe, that the Perspiratory Vessels or Exhalents are
Continuations of Arteries, tho' transudation may better account
for the - Situation - The Arteries begin almost in

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