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OF THE ORGANIC SYSTEM. 105
tion of the blood, congesting
it in the viscera of the
chest and abdomen, or throwing it to the surface. That
fills the capillaries, or empties them. That causes a
limb to become pale and cold, or gives it the swelling,
redness, and heat of a violent inflammation.
And though the organic bases the animal, the animal
and emotions
presides over the organic. The passions
of the mind influence the most purely organic functions.
The ardor of hope, or desire, may give warmth to the
whole system, while disappointment or fear may chill
the frame, and set the teeth to chattering.
The emo
tion of jealousy may make the hands, in a few mo
ments, turn deathly cold ; or a happy love may make
them glow with the fires of passion. A thought sends
the hot blood to the face in blushes. Disappointed
love gives the sensation of a hard, dull, aching oppression
round the heart. The lungs are constricted, and re
lieve themselves by frequent sighs. The heart may
even break from the excess of this passion, in its painful
and discordant action. Many such facts will suggest
themselves to the observing reader.
The manner in which demand governs supply in the
organic system is a proof that this law of supply and de
mand is fundamental, and therefore universal. In the
water-cure, we practice constantly upon this principle.
If we want blood and action in a part grown weak and
diseased, we apply cold. The increased and urgent
demand brings the supply ; and, as power increases by
exercise, there soon comes the habit of action, and a
cure. Heat, in the whole system, as in its parts, is
generated as it is required. Supply is in proportion to
demand. Send a man to discover the North Pole, and