[14] `North American Indians,' 3rd edit. 1842, vol. i. p. 105.
[15] H. Wedgwood, Dict. of English Etymology, vol. ii. 1862, p. 35. See, also, Gratiolet (`De la Physionomie,' p. 135) on the sources of such words as `terror, horror, rigidus, frigidus,' &c.
The heart beats quickly and violently, so that it palpitates or knocks against the ribs; but it is very doubtful whether it then works more efficiently than usual, so as to send a greater supply of blood to all parts of the body; for the skin instantly becomes pale, as during incipient faintness. This paleness of the surface, however, is probably in large part, or exclusively, due to the vasomotor centre being affected in such a manner as to cause the contraction of the small arteries of the skin. That the skin is much affected under the sense of great fear, we see in the marvellous and inexplicable manner in which perspiration immediately exudes from it. This exudation is all the more remarkable, as the surface is then cold, and hence the term a cold sweat; whereas, the sudorific glands are properly excited into action when the surface is heated. The hairs also on the skin stand erect; and the superficial muscles shiver. In connection with the disturbed action of the heart, the breathing is hurried. The salivary glands act imperfectly; the mouth becomes dry,[16] and is often opened and shut. I have also noticed that under slight fear there is a strong tendency to yawn. One of the best-marked symptoms is the trembling of all the muscles of the body; and this is often first seen in the lips. From this cause, and from the dryness of the mouth, the voice becomes husky or indistinct, or may altogether fail. "Obstupui, steteruntque comae, et vox faucibus haesit."
[16] Mr. Bain (`The Emotions and the Will,' 1865, p. 54) explains in the following manner the origin of the custom "of subjecting criminals in India to the ordeal of the morsel of rice. The accused is made to take a mouthful of rice, and after a little time to throw it out. If the morsel is quite dry, the party is believed to be guilty,-- his own evil conscience operating to paralyse the salivating organs."
Of vague fear there is a well-known and grand description in Job:--"In thoughts from the visions of the night, when deep sleep falleth on men, fear came upon me, and trembling, which made all my bones to shake. Then a spirit passed before my face; the hair of my flesh stood up. It stood still, but I could not discern the form thereof: an image was before my eyes, there was silence, and I heard a voice, saying, Shall mortal man be more just than God? Shall a man be more pure than his Maker?" (Job iv. 13)
As fear increases into an agony of terror, we behold, as under all violent emotions, diversified results. The heart beats wildly, or may fail to act and faintness ensue; there is a death-like pallor; the breathing is laboured; the wings of the nostrils are wildly dilated; "there is a gasping and convulsive motion of the lips, a tremor on the hollow cheek, a gulping and catching of the throat;"[17] the uncovered and protruding eyeballs are fixed on the object of terror; or they may roll restlessly from side to side, _huc illuc volvens oculos totumque pererrat_.[18] The pupils are said to be enormously dilated. All the muscles of the body may become rigid, or may be thrown into convulsive movements. The hands are alternately clenched and opened, often with a twitching movement. The arms may be protruded, as if to avert some dreadful danger, or may be thrown wildly over the head. The Rev. Mr. Hagenauer has seen this latter action in a terrified Australian. In other cases there is a sudden and uncontrollable tendency to headlong flight; and so strong is this, that the boldest soldiers may be seized with a sudden panic.
[17] Sir C. Bell, Transactions of Royal Phil. Soc. 1822, p. 308. `Anatomy of Expression,' p. 88 and pp. 164-469.
[18] See Moreau on the rolling of the eyes, in the edit. of 1820 of Lavater, tome iv.