[8]
[4] Mr. Bartlett, "Notes on the Birth of
a Hippopotamus," Proc. Zoolog. Soc. 1871, p. 255.
[5] See, on this subject, Claude Bernard, `Tissus Vivants,' 1866, pp.
316, 337, 358. Virchow expresses himself to almost exactly the same
effect in his essay "Ueber das Ruckenmark" (Sammlung wissenschaft.
Vortrage, 1871, s. 28).
An emotion may be very strong, but it will have little tendency
to induce movements of any kind, if it has not commonly led to
voluntary action for its relief or gratification; and when movements
are excited, their nature is, to a large extent, determined by those
which have often and voluntarily been performed for some definite
end under the same emotion. Great pain urges all animals, and has
urged them during endless generations, to make the most violent
and diversified efforts to escape from the cause of suffering.
Even when a limb or other separate part of the body is hurt,
we often see a tendency to shake it, as if to shake off the cause,
though this may obviously be impossible. Thus a habit of exerting
with the utmost force all the muscles will have been established,
whenever great suffering is experienced.
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