Some of the expressive actions of monkeys are interesting
in another way, namely from being closely analogous to those of man.
As I have had no opportunity of observing any one species of the group
under all circumstances, my miscellaneous remarks will be best arranged
under different states of the mind.
[9] `Land and Water,' 1869, p. 152.
_Pleasure, joy, affection_--It is not possible to distinguish
in monkeys, at least without more experience than I have had,
the expression of pleasure or joy from that of affection.
Young chimpanzees make a kind of barking noise, when pleased
by the return of any one to whom they are attached.
When this noise, which the keepers call a laugh, is uttered,
the lips are protruded; but so they are under various other emotions.
Nevertheless I could perceive that when they were pleased
the form of the lips differed a little from that assumed
when they were angered. If a young chimpanzee be tickled--
and the armpits are particularly sensitive to tickling, as in
the case of our children,--a more decided chuckling or laughing
sound is uttered; though the laughter is sometimes noiseless.
The corners of the mouth are then drawn backwards; and this
sometimes causes the lower eyelids to be slightly wrinkled.
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