Whatever amount of truth the so-called science of physiognomy may contain, appears to depend, as Haller long ago remarked,[4] on different persons bringing into frequent use different facial muscles, according to their dispositions; the development of these muscles being perhaps thus increased, and the lines or furrows on the face, due to their habitual contraction, being thus rendered deeper and more conspicuous. The free expression by outward signs of an emotion intensifies it. On the other hand, the repression, as far as this is possible, of all outward signs softens our emotions.[5] He who gives way to violent gestures will increase his rage; he who does not control the signs of fear will experience fear in a greater degree; and he who remains passive when overwhelmed with grief loses his best chance of recovering elasticity of mind. These results follow partly from the intimate relation which exists between almost all the emotions and their outward manifestations; and partly from the direct influence of exertion on the heart, and consequently on the brain. Even the simulation of an emotion tends to arouse it in our minds. Shakespeare, who from his wonderful knowledge of the human mind ought to be an excellent judge, says:--
Is it not monstrous that this player here, But in a fiction, in a dream of passion, Could force his soul so to his own conceit, That, from her working, all his visage wann'd; Tears in his eyes, distraction in 's aspect, A broken voice, and his whole function suiting With forms to his conceit? And all for nothing! _Hamlet_, act ii. sc. 2.
[4] Quoted by Moreau, in his edition of Lavater, 1820, tom. iv. p. 211.
We have seen that the study of the theory of expression confirms to a certain limited extent the conclusion that man is derived from some lower animal form, and supports the belief of the specific or sub-specific unity of the several races; but as far as my judgment serves, such confirmation was hardly needed. We have also seen that expression in itself, or the language of the emotions, as it has sometimes been called, is certainly of importance for the welfare of mankind. To understand, as far as possible, the source or origin of the various expressions which may be hourly seen on the faces of the men around us, not to mention our domesticated animals, ought to possess much interest for us. From these several causes, we may conclude that the philosophy of our subject has well deserved the attention which it has already received from several excellent observers, and that it deserves still further attention, especially from any able physiologist.
[5] Gratiolet (`De la Physionomie,' 1865, p. 66) insists on the truth of this conclusion.