ive motions are much impaired, seems to arise from this cause; the
vessels of these membranes or muscles become torpid by their irritative
associations with other parts of the body, and thence produce less of their
accustomed secretions, and in consequence less heat is evolved, and they
experience the pain of cold; which coldness may often be felt by the hand
applied upon the affected part.

2. The importance of a greater or less deduction of heat from the system
will be more easy to comprehend, if we first consider the great expense of
sensorial power used in carrying on the vital motions; that is, which
circulates, absorbs, secretes, aerates, and elaborates the whole mass of
fluids with unceasing assiduity. The sensorial power, or spirit of
animation, used in giving perpetual and strong motion to the heart, which
overcomes the elasticity and vis inertiae of the whole arterial system; next
the expense of sensorial power in moving with great force and velocity the
innumerable trunks and ramifications of the arterial system; the expense of
sensorial power in circulating the whole mass of blood through the long and
intricate intortions of the very fine vessels, which compose the glands and
capillaries; then the expense of sensorial power in the exertions of the
absorbent extremities of all the lacteals, and of all the lymphatics, which
open their mouths on the external surface of the skin, and on the internal
surfaces of every cell or interstice of the body; then the expense of
sensorial power in the venous absorption, by which the blood is received
from the capillary vessels, or glands, where the arterial power ceases, and
is drank up, and returned to the heart; next the expense of sensorial power
used by the muscles of respiration in their office of perpetually expanding
the bronchia, or air-vessels, of the lungs; and lastly in the unceasing
peristaltic motions of the stomach and whole system of intestines, and in
all the secretions of bile, gastric juice, mucus, perspirable matter, and
the various excretions from the system. If we consider the ceaseless
expense of sensorial power thus perpetually employed, it will appear to be
much greater in a day than all the voluntary exertions of our muscles and
organs of sense consume in a week; and all this without any sensible
fatigue! Now, if but a part of these vital motions are impeded, or totally
stopped for but a short time, we gain an idea, that there must be a great
accumul