sensorial
power of sensation, and proceed in confusion. Thus if the irritative ideas
of sight are disturbed, the paralactic motions of objects, which in general
are unperceived, become sensible to us; and the locomotive muscles
associated with them, which ought to preserve the body erect, stagger from
this decrease or interruption of the sensorial power of association; and
vertigo is produced.

When the irritative sensual motions, or ideas, belonging to one sense are
increased or diminished, the irritative sensual motions, or ideas, of the
other senses are liable to become disturbed by their general catenations;
whence occur noises in the ears, bad tastes in the mouth, bad odours, and
numbness or tingling of the limbs, as a greater or less number of senses
are affected. These constitute concomitant circles of disturbed irritative
ideas; or make a part of the great circle of irritative ideas, or motions
of the organs of sense; and when thus disturbed occasion many kinds of
hallucination of our other senses, or attend on the vertigo of vision.

2. Another great circle of irritative associated motions consists of those
of the alimentary canal; which are catenated with stimuli or with
influences external to the system, but continue to be exerted in our
sleeping as well as in our waking hours. When these associations of motion
are disturbed by the too great or too small stimulus of the food taken into
the stomach, or by the too great excess or deprivation of heat, or by
indigestible substances, or by torpor or orgasm occasioned by their
association with other parts, various diseases are induced under the names
of apepsia, hypochondriasis, hysteria, diarrhoea, cholera, ileus,
nephritis, fever.

3. A third circle of irritative associate motions consists of those of the
absorbent system; which may be divided into two, the lacteals, and the
lymphatics. When the stomach and intestines are recently filled with food
and fluid, the lacteal system is stimulated into great action; at the same
time the cellular, cutaneous, and pulmonary lymphatics act with less
energy; because less fluid is then wanted from those branches, and because
more sensorial power is expended by the lacteal branch. On this account
these two systems of absorbents are liable to act by reverse sympathy;
hence pale urine is made after a full dinner, as less of the aqueous part
of it is imbibed by the urinary lymphatics; and hence the water in anasarca
of the lun