EXPLANATION OF PLATE III.
This Plate represents the minuter branches and
sub-divisions of the arteries of the web ; their
final divisions into capillaries in which the globules
become distinct; and the union of these so as to
form the roots of veins.
The arteries subdivide into smaller branches.
The capillaries continually unite and re-divide,
retaining a uniform size and a uniform velocity
of circulation ; the various roots unite successively,
forming larger and larger veins, and anastomose
occasionally, still preserving the velocity of the
capillary circulation.
Figures 2. and 3. represent the two layers of
capillaries. In figure 2, the blood in the upper
layer has been rendered stagnant by the application
of alcohol. In figure 3, the lower layer of capillaries
is affected by the spirit.
