When a flock of sheep is scattered, the ewes bleat incessantly for
their lambs, and their mutual pleasure at coming together is manifest.
Woe betide the man who meddles with the young of the larger and
fiercer quadrupeds, if they hear the cry of distress from their young.
Rage leads to the violent exertion of all the muscles, including those
of the voice; and some animals, when enraged, endeavour to strike
terror into their enemies by its power and harshness, as the lion
does by roaring, and the dog by growling. I infer that their object
is to strike terror, because the lion at the same time erects
the hair of its mane, and the dog the hair along its back, and thus
they make themselves appear as large and terrible as possible.
Rival males try to excel and challenge each other by their voices,
and this leads to deadly contests. Thus the use of the voice will have
become associated with the emotion of anger, however it may be aroused.
We have also seen that intense pain, like rage, leads to violent outcries,
and the exertion of screaming by itself gives some relief; and thus
the use of the voice will have become associated with suffering
of any kind.
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