d to absorb and transmit into the
circulation, were now less wanted; and that hence by habit a reverse
sympathy obtained between these branches of the absorbents of the
alimentary canal, and those of the other parts of the body.

Now, as at this time less fluid was absorbed by the cutaneous and cellular
lymphatics, it would happen, that less would be secreted by their
correspondent secerning vessels, or capillary glands; and that hence by
habit, these secerning vessels would acquire a reverse sympathy of action
with the secerning vessels of the alimentary canal.

Thus when the absorption of the tears by the puncta lacrymalia is much
increased by the stimulus of snuff; or of an affecting idea, on the nasal
dusts, as explained in Sect. XVI. 8. 2. a great increase of the secretion
of tears from the lacrymal glands is produced by the direct sympathy of the
action of these glands with those of their correspondent absorbents; and
that though in this case they are placed at so great a distance from each
other.

4. A difficult question here occurs; why does it happen, that in fevers
with weak pulse the contractions of the heart and arteries become at the
same time more frequent; which also sometimes occurs in chlorosis, and in
some hysteric and hypochondriac diseases, and in some insanities; yet at
other times the weak pulse becomes at the same time slow, as in the
exhibition of digitalis, and in paresis irritativa, described in Class I.
2. 1. 2. which may be termed a fever with slow pulse? this frequency of
pulse can not depend on heat, because it sometimes exists without heat, as
towards the end of some fevers with debility.

Now as apoplexies, which are sometimes ascribed to fulness of blood, are
attended with slow pulse; and as in animals dying in the slaughter house
from deficiency of blood the pulse becomes frequent in extreme; may not the
frequency of pulse in fevers with arterial debility be in general owing to
paucity of blood? as explained in Sect. XXXII. 2. 3. and its slowness in
paresis irritativa be caused by the debility being accompanied with due
quantity of blood? or may not the former circumstance sometimes depend on a
concomitant affection of the brain approaching to sleep? or to the unusual
facility of the passage of the blood through the pulmonary and aortal
capillaries? in which circumstance the heart may completely empty itself at
each pulsation, though its contractions may be weak. While the latter
dep