234: DECISION. CHAP. IX. f. the month is not hahitually and firmly closed., is com- monly thought to be characteristic of feebleness of char- acter. A prolonged effort of any kind, whether of body or mind., implies previous determination; and if it can be shown that the mouth is generally closed with firm- ness before and during a great and continued exertion of the muscular system, then, through the principle of association, the mouth would almost certainly be closed as soon as any determined resolution was taken. Now , several observers have noticed that a man,, in commenc- ing any violent muscular effort, invariably first distends his lungs with air, and then compresses it by the strong contraction of the muscles of the chest; and to effect this the mouth must be firmly closed. Moreover, as soon as the man is compelled to draw breath, he still keeps his chest as much distended as possible. • Various causes have been assigned for this manner of acting. 'Sir C. Bell maintains 13 that the chest is dis- tended with air, and is kept distended at such times, in order to give a fixed support to the muscles which are thereto attached. Hence, as he remarks, when two men are engaged in a deadly contest, a terrible silence pre- vails, broken only by hard stifled breathing. There is silence, because to expel the air in the utterance of any sound would be to relax the support for the muscles of the arms. If an outcry is heard, supposing the struggle to take place in the dark, we at once know that one of the two has given up in despair. Gratiolet admits14 that when a man has to struggle with another to his utmost, or has to support a great weight, or to keep for a long time the same forced atti- tude, it is necessary for him first to make a deep inspira- 13 * Anatomy of Expression,' p. 190. u ' De la Physionomie,' pp. 118-121.