[21] `Descent of Man,' vol, i. p, 43.
Terror is expressed by many kinds of monkeys by the utterance of
shrill screams; the lips being drawn back, so that the teeth are exposed.
The hair becomes erect, especially when some anger is likewise felt.
Mr. Sutton has distinctly seen the face of the _Macacus rhesus_
grow pale from fear. Monkeys also tremble from fear; and sometimes
they void their excretions. I have seen one which, when caught,
almost fainted from an excess of terror.
Sufficient facts have now been given with respect to the expressions of
various animals. It is impossible to agree with Sir C. Bell when he says[22]
that "the faces of animals seem chiefly capable of expressing rage and fear;"
and again, when he says that all their expressions "may be referred,
more or less plainly, to their acts of volition or necessary instincts."
He who will look at a dog preparing to attack another dog or a man, and at
the same animal when caressing his master, or will watch the countenance
of a monkey when insulted, and when fondled by his keeper, will be forced
to admit that the movements of their features and their gestures are almost
as expressive as those of man.
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