Young orangs and chimpanzees protrude their lips to an extraordinary degree,
as described in a former chapter, when they are discontented, somewhat angry,
or sulky; also when they are surprised, a little frightened, and even
when slightly pleased. Their mouths are protruded apparently for the sake
of making the various noises proper to these several states of mind;
and its shape, as I observed with the chimpanzee, differed slightly when
the cry of pleasure and that of anger were uttered. As soon as these animals
become enraged, the shape of the month wholly changes, and the teeth
are exposed. The adult orang when wounded is said to emit "a singular cry,
consisting at first of high notes, which at length deepen into a low roar.
While giving out the high notes he thrusts out his lips into a funnel shape,
but in uttering the low notes he holds his mouth wide open."[11] With
the gorilla, the lower lip is said to be capable of great elongation.
If then our semi-human progenitors protruded their lips when sulky or a
little angered, in the same manner as do the existing anthropoid apes,
it is not an anomalous, though a curious fact, that our children
should exhibit, when similarly affected, a trace of the same expression,
together with some tendency to utter a noise.
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