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panying drawing represents a chimpanzee made sulky by an orange having been offered him； and then taken away。 A similar protrusion or pouting of the lips； though to a much slighter degree； may be seen in sulky children。
＇15＇ Brehm remarks （‘Thierleben；' s。 68） that the eyebrows of the _Inuus ecaudatus_ are frequently moved up and down when the animal is angered。
＇16＇ G。 Bennett； ‘Wanderings in New South Wales；' &c。 vol。 ii。 1834； p。 153。 FIG。 18。…Chimpanzee disappointed and sulky。 Drawn from life by Mr。 Wood。
Many years ago； in the Zoological Gardens； I placed a looking…glass on the floor before two young orangs； who； as far as it was known； had never before seen one。 At first they gazed at their own images with the most steady surprise； and often changed their point of view。 They then approached close and protruded their lips towards the image； as if to kiss it； in exactly the same manner as they had previously done towards each other； when first placed； a few days before； in the same room。 They next made all sorts of grimaces； and put themselves in various attitudes before the mirror； they pressed and rubbed the surface； they placed their hands at different distances behind it； looked behind it； and finally seemed almost frightened； started a little； became cross； and refused to look any longer。
When we try to perform some little action which is difficult and requires precision； for instance； to thread a needle； we generally close our lips firmly； for the sake； I presume； of not disturbing our movements by breathing； and I noticed the same action in a young Orang。 The poor little creature was sick； and was amusing itself by trying to kill the flies on the window…panes with its knuckles； this was difficult as the flies buzzed about； and at each attempt the lips were firmly compressed； and at the same time slightly protruded。
＇17＇ W。 L。 Martin； Nat。 Hist。 of Mamm。 Animals； 1841； p。 405。
Although the countenances； and more especially the gestures； of orangs and chimpanzees are in some respects highly expressive； I doubt whether on the whole they are so expressive as those of some other kinds of monkeys。 This may be attributed in part to their ears being immovable； and in part to the nakedness of their eyebrows； of which the movements are thus rendered less conspicuous。 When； however； they raise their eyebrows their foreheads become； as with us； transversely wrinkled。 In comparison with man； their faces are inexpressive； chiefly owing to their not frowning under any emotion of the mindthat is； as far as I have been able to observe； and I carefully attended to this point。 Frowning； which is one of the most important of all the expressions in man； is due to the contraction of the corrugators by which the eyebrows are lowered and brought together； so that vertical furrows are formed on the forehead。 Both the orang and chimpanzee are said＇18＇ to possess this muscle； but it seems rarely brought into action； at least in a conspicuous manner。 I made my hands into a sort of cage； and placing some tempting fruit within； allowed both a young orang and chimpanzee to try their utmost to get it out； but although they grew rather cross； they showed not a trace of a frown。 Nor was there any frown when they were enraged。 Twice I took two chimpanzees from their rather dark room suddenly into bright sunshine； which would certainly have caused us to frown； they blinked and winked their eyes； but only once did I 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。
＇18＇ Prof。 Owen on the Orang； Proc。 Zool。 Soc。 1830； p。 28。 On the Chimpanzee； see Prof。 Macalister； in Annals and Mag。 of Nat。 Hist。 vol。 vii。 1871； p。 342； who states that the _corrugator supercilii_ is inseparable from the _orbicularis palpebrarum_。
The gorilla； when enraged； is described as erecting its crest of hair； throwing down its under lip； dilating its nostrils； and uttering terrific yells。 Messrs。 Savage and Wyman＇19＇ state that the scalp can be freely moved backwards and forwards； and that when the animal is excited it is strongly contracted； but I presume that they mean by this latter expression that the scalp is 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； deserves notice in relation to the power possessed by some few men； either through reversion or persistence； of voluntarily moving their scalps。＇20＇
_Astonishment； Terror_A living fresh…water turtle was placed at my request in the same compartment in the Zoological Gardens with many monkeys； and they showed unbounded astonishment； as well as some fear。 This was displayed by their remaining motionless； staring intently with widely opened eyes； their eyebrows being often moved up and down。 Their faces seemed somewhat lengthened。 They occasionally raised themselves on their hind…legs to get abetter view。 They often retreated a few feet； and then turning their heads over one shoulder； again stared intently。 It was curious to observe how much less afraid they were of the turtle than of a living snake which I had formerly placed in their compartment；＇21＇ for in the course of a few minutes some of the monkeys ventured to approach and touch the turtle。 On the other hand； some of the larger baboons were greatly terrified； and grinned as if on the point of screaming out。 When I showed a little dressed…up doll to the _Cynopithecus niger_； it stood motionless； stared intently with widely opened eyes； and advanced its ears a little forwards。 But when the turtle was placed in its compartment； this monkey also moved its lips in an odd； rapid； jabbering manner； which the keeper declared was meant to conciliate or please the turtle。
＇19＇ Boston Journal of Nat。 Hist。 1845…47； vol。 v。 p。 423。 On the Chimpanzee； ibid。 1843…44； vol。 iv。 p。 365。
＇20＇ See on this subject； ‘Descent of Man；' vol。 i。 p。 20。
I was never able clearly to perceive that the eyebrows of astonished monkeys were kept permanently raised； though they were frequently moved up and down。 Attention； which precedes astonishment； is expressed by man by a slight raising of the eyebrows； and Dr。 Duchenne informs me that when he gave to the monkey formerly mentioned some quite new article of food； it elevated its eyebrows a little； thus assuming an appearance of close attention。 It then took the food in its fingers； and； with lowered or rectilinear eyebrows； scratched； smelt； and examined it； an expression of reflection being thus exhibited。 Sometimes it would throw back its head a little； and again with suddenly raised eyebrows re…examine and finally taste the food。
In no case did any monkey keep its mouth open when it was astonished。 Mr。 Sutton observed for me a young orang and chimpanzee during a considerable length of time； and however much they were astonished； or whilst listening intently to some strange sound； they did not keep their mouths op