Short discussions on Expression may be found in various works,
which need not here be particularised. Mr. Bain, however,
in two of his works has treated the subject at some length.
He says,[8] "I look upon the expression so-called as part and parcel
of the feeling. I believe it to be a general law of the mind
that along with the fact of inward feeling or consciousness,
there is a diffusive action or excitement over the bodily members."
In another place he adds, "A very considerable number of the facts
may be brought under the following principle: namely, that states
of pleasure are connected with an increase, and states of pain
with an abatement, of some, or all, of the vital functions."
But the above law of the diffusive action of feelings seems too
general to throw much light on special expressions.
Mr. Herbert Spencer, in treating of the Feelings in his `Principles
of Psychology' (1855), makes the following remarks:--"Fear,
when strong, expresses itself in cries, in efforts to hide or escape,
in palpitations and tremblings; and these are just the manifestations
that would accompany an actual experience of the evil feared.
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