[12] C. Vogt, `Memoire sur les Microcephales,' 1867, p. 21.
[13] Sir C. Bell, `Anatomy of Expression,' p. 133.
[14] `Mimik und Physiognomik,' 1867, s. 63-67.
To return to the sounds produced during laughter. We can see
in a vague manner how the utterance of sounds of some kind would
naturally become associated with a pleasurable state of mind;
for throughout a large part of the animal kingdom vocal or
instrumental sounds are employed either as a call or as a charm
by one sex for the other. They are also employed as the means
for a joyful meeting between the parents and their offspring,
and between the attached members of the same social community.
But why the sounds which man utters when he is pleased have
the peculiar reiterated character of laughter we do not know.
Nevertheless we can see that they would naturally be as
different as possible from the screams or cries of distress;
and as in the production of the latter, the expirations
are prolonged and continuous, with the inspirations short
and interrupted, so it might perhaps have been expected
with the sounds uttered from joy, that the expirations would
have been short and broken with the inspirations prolonged;
and this is the case.
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