ABSTRACT
The various species and genera of monkeys express their feelings in many different ways; this fact is interesting, as in some degree bearing on the question, whether the so-called races of man should be ranked as distinct species or varieties. Some of the expressive actions of monkeys are interesting in another way, namely from being closely analogous to those of man. The appearance of dejection in young orangs and chimpanzees, when out of health, is as plain and almost as pathetic as in the case of human children. Baboons often show their passion and threaten their enemies in a very odd manner, namely, by opening their mouths widely as in the act of yawning. Many display their anger by suddenly advancing, making abrupt starts, at the same time opening the mouth and pursing up the lips, so as to conceal the teeth, while the eyes are daringly fixed on the enemy, as if in savage defiance.
