eased sensorial power
of association is the proximate cause; the preceding increased action of
the bowels is the remote cause; and the proximate effect is the violent
contractions of the musculi gastrocnemii; but the pain of these muscles is
only an attendant symptom, or a remote effect. See Sect. XVIII. 15. Other
sensitive associations are mentioned in Class IV. 1. 2. and IV. 1. 2. 15.

Thus, if the flushing of the face above mentioned after dinner be called a
disease, the immediate or proximate cause is the increased power of
association, the remote cause is the increased irritative motions of the
stomach in consequence of the stimulus of food and wine. The disease or
proximate effect consists in the increased actions of the cutaneous vessels
of the face; and the sensation of heat, the existence of heat, and the red
colour, are attendants or symptoms, or remote effects, of the increased
actions of these cutaneous vessels.

F. _Direct and reverse Sympathy._

The increased actions of the primary part of the trains of associated
motions are sometimes succeeded by increased actions of the secondary part
of the train; and sometimes by decreased actions of it. So likewise the
decreased actions of the primary part of a train of associate motions are
sometimes succeeded by decreased actions of the secondary part, and
sometimes by increased actions of it. The former of these situations is
called direct sympathy, and the latter reverse sympathy. In general I
believe, where the primary part of the train of associated motions is
exerted more than natural, it produces direct sympathy in strong people,
and reverse sympathy in weak ones, as a full meal makes some people hot,
and others chill. And where the primary part of the train is exerted less
than natural, it produces direct sympathy in weak people, and reverse
sympathy in strong ones, as on being exposed for a certain length of time
on horseback in a cold day gives indigestion and consequent heart-burn to
weak people, and strengthens the digestion, and induces consequent hunger
in strong ones. See Sect. XXXV. 1.

This may perhaps be more easily understood, by considering strength and
weakness, when applied to animal bodies, as consisting in the quantity of
sensorial power residing in the contracting fibres, and the quantity of
stimulus applied, as shewn in Sect. XII. 2. 1. Now when defective stimulus,
within certain limits, is partially applied to parts subject to perpetual