But actions of this kind are often combined with others,
which follow from our first principle, namely, that actions
which have often been of direct or indirect service,
under certain states of the mind, in order to gratify or relieve
certain sensations, desires, &c., are still performed under
analogous circumstances through mere habit although of no service.
We have combinations of this kind, at least in part, in the
frantic gestures of rage and in the writhings of extreme pain;
and, perhaps, in the increased action of the heart and of
the respiratory organs. Even when these and other emotions
or sensations are aroused in a very feeble manner, there will
still be a tendency to similar actions, owing to the force
of long-associated habit; and those actions which are least
under voluntary control will generally be longest retained.
Our second principle of antithesis has likewise occasionally
come into play.
Finally, so many expressive movements can be explained, as I trust
will be seen in the course of this volume, through the three
principles which have now been discussed, that we may hope hereafter
to see all thus explained, or by closely analogous principles.
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