(31

211

Chap. V

they were enraged. On no occasion could I see a frown on the forehead of the young orang. Twice I took two chimpanzees from their rather dark room suddenly into bright sunshine, which would certainly have caused it to frown; they blinked and winked their eyes, and on one occasion alone but only once did I distinctly saw see a very slight frown.

On another occasion, I tickled the nose of a chimpanzee with a straw, and as it crumpled up its face, slight vertical furrows appeared between the eyebrows. I have never seen a frown on the forehead of the orang.

The enraged gorilla in a state of nature is described as erecting its crest of hair, throwing down the its under lip, and with dilating its nostrils, & uttering terrific yells. Messrs. Savage and Wyman*(19) state that the scalp can be freely moved backwards and forwards, and, that it is said to be strongly contracted when the animal is excited; but I presume that they mean by this expression that the scalp is much lowered; for they likewise speak of the young chimpanzee, when crying out, "as having the eyebrows strongly contracted." The great power of movement in the scalp of the gorilla, of many baboons and other monkeys, for instance of the Cynopitecus niger deserves notice in relation to the power possessed by some few men, either through through reversion or persistence, of voluntarily moving their scalps.*(20)