Although when thus affected, our mouths are generally opened, yet the lips are often a little protruded. This fact reminds us of the same movement, though in a much more strongly marked degree, in the chimpanzee and orang when astonished. As a strong expiration naturally follows the deep inspiration which accompanies the first sense of startled surprise, and as the lips are often protruded, the various sounds which are then commonly uttered can apparently be accounted for. But sometimes a strong expiration alone is heard; thus Laura Bridgman, when amazed, rounds and protrudes her lips, opens them, and breathes strongly.[1209] One of the commonest sounds is a deep _Oh_; and this would naturally follow, as explained by Helmholtz, from the mouth being moderately opened and the lips protruded. On a quiet night some rockets were fired from the ‘Beagle,’ in a little creek at Tahiti, to amuse the natives; and as each rocket, was let off there was absolute silence, but this was invariably followed by a deep groaning _Oh_, resounding all round the bay. Mr. Washington Matthews says that the North American Indians express astonishment by a groan; and the negroes on the West Coast of Africa, according to Mr. Winwood Reade, protrude their lips, and make a sound like _heigh, heigh_. If the mouth is not much opened, whilst the lips are considerably protruded, a blowing, hissing, or whistling noise is produced. Mr. R. Brough Smith informs me that an Australian from the interior was taken to the theatre to see an acrobat rapidly turning head over heels: “he was greatly astonished, and protruded his lips, making a noise with his mouth as if blowing out a match.” According to Mr. Bulmer the Australians, when surprised, utter the exclamation _korki_, “and to do this the mouth is drawn out as if going to whistle.” We Europeans often whistle as a sign of surprise; thus, in a recent novel[1210] it is said, “here the man expressed his astonishment and disapprobation by a prolonged whistle.” A Kafir girl, as Mr. J. Mansel Weale informs me, “on hearing of the high price of an article, raised her eyebrows and whistled just as a European would.” Mr. Wedgwood remarks that such sounds are written down as _whew_, and they serve as interjections for surprise. According to three other observers, the Australians often evince astonishment by a clucking noise. Europeans also sometimes express gentle surprise by a little clicking noise of nearly the same kind. We have seen that when we are startled, the mouth is suddenly opened; and if the tongue happens to be then pressed closely against the palate, its sudden withdrawal will produce a sound of this kind, which might thus come to express surprise. Gestures of the Body. Plate VII