I'i 136 SPECIAL EXPRESSIONS: CHAP. V. Anger.—This emotion is often exhibited by many kinds of monkeys, and is expressed., as Mr. Martin re- marks,13 in many different ways. " Some species, when irritated, pout the lips, gaze with a fixed and savage glare on their foe, and make repeated short starts as if about to spring forward, uttering at the same time inward gut- tural sounds. Many display their anger by suddenly advancing, making abrupt starts, at the same time open- ing the mouth and pursing up the lips, so as to conceal tlic teeth, while the eyes arc daringly fixed on the enemy, as if in savage defiance. Some again, and principally the long-tailed monkeys, or Gucnons, display their teeth, and accompany their malicious grins with a sharp, abrupt, reiterated cry." Mr. Sutton confirms the state- ment that some species uncover their teeth when en- raged, whilst others conceal them by the protrusion of their lips; and some kinds draw back their cars. The Cynopitlwciis niyer, lately referred to, acts in tills man- ner, at the same time depressing the crest of hair on its forehead, and showing its teeth; so that the movements of the features from anger are nearly the same as those from pleasure; and the two expressions can be distin- guished only by those familiar with the animal. Baboons often sbow their passion and threaten their enemies in a very odd manner, namely, by opening their mouths widely as in the act of yawning. Mr. Bartlo.tfc lias often seen two baboons, when first placed in the same compartment, sitting opposite to each other and. thus alternately opening their mouths; and this action seems frequently to end in a real yawn. Mr. Bartlctt bcliovcs that both animals wish to show to each other that they are provided with a formidable set of teeth, as is undoubtedly the case. As I could hardly credit the Nat. Hist, of Mammalia, 1841, p. 351.