[15] As we associate
in the case of man the raising and lowering of the eyebrows
with definite states of the mind, the almost incessant movement
of the eyebrows by monkeys gives them a senseless expression.
I once observed a man who had a trick of continually raising
his eyebrows without any corresponding emotion, and this gave
to him a foolish appearance; so it is with some persons who keep
the corners of their mouths a little drawn backwards and upwards,
as if by an incipient smile, though at the time they are not
amused or pleased.
[14] Brehm, `Thierleben,' B. i. s. 84. On baboons striking
the ground, s. 61.
A young orang, made jealous by her keeper attending to another monkey,
slightly uncovered her teeth, and, uttering a peevish noise like _tish-shist_,
turned her back on him. Both orangs and chimpanzees, when a little
more angered, protrude their lips greatly, and make a harsh barking noise.
A young female chimpanzee, in a violent passion, presented a curious
resemblance to a child in the same state. She screamed loudly with widely
open mouth, the lips being retracted so that the teeth were fully exposed.
She threw her arms wildly about, sometimes clasping them over her head.
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