232 SULKINESS. CHAP. IX. reversion to it. Young orangs and chimpanzees pro- trude their lips to an extraordinary degree, as described in a former chapter, when they are discontented, some- what 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 mak- ing 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 mouth 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." 13- 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 curi- ous fact, that our children should exhibit, when similarly affected, a trace of the same expression, together with some tendency to utter a noise. For it is not at all un- usual for animals to retain, more or less perfectly, during early youth, and subsequently to lose, characters which were aboriginally possessed by their adult progenitors, and which are still retained by distinct species, their near relations. Nor is it an anomalous fact that the children of sav- ages should- exhibit a stronger tendency to protrude their lips, when sulky, than the children of civilized u Miiller, as quoted by Huxley, * Man's Place in Nature,' 1863, p. 38.