Читать книгу Fear - A. Mosso - Страница 8

Table of Contents

Many may regret that such a characteristic difference between man and the other animals should be effaced, and that we should try in cold blood to prove that what is most noble, beautiful, and human in our countenance, we have in common with the brutes. But we console ourselves with the reflection that poetry, enthusiasm, inspiration and passion rise again under new and stronger forms in the contemplation of reality, that in the search after truth there lies a fascination which beautifies and ennobles the human intelligence, and that sentiment is never extinguished by any advance of science.

To-day, when the experimental method is spreading so rapidly, it behoves us physiologists to be humble and to ask for hospitality in the studio of the artist, in the libraries of men of letters, in the drawing-rooms of cultured people, in order to diffuse the elementary principles of our science. The time has come when we must throw off our professorial robes, tie on our aprons, roll up our sleeves, and begin the vivisection of the human heart according to scientific methods.

Let the artist no longer confine himself to a blind imitation of nature, to a perpetual reproduction on canvas, in marble, or in books of the phenomena and forms of life; he must know the why and wherefore of things, completely or in part, the connection between cause and effect; he must convince himself that nothing is the result of chance and that there is a reason behind every phenomenon. Blushing—that ideal token of innocence and purity—is no accidental fact; it was not given to man as a sign of nobility, nor as a mirror to reflect the agitation of his heart; it is a fact rendered necessary by bodily functions and which the will can neither produce nor suppress. It is simply caused by the structure of our vital machine, by the activity of the blood-vessels in all organs and in all animals.

Darwin believed, on the contrary, that it was a phenomenon produced by means of the will. I consider it advisable to quote here in full the explanation which he gives of blushing, as no other naturalist made it the object of such special study, and because his hypothesis is at variance with the facts of my observation.

'Men and women, and especially the young, have always valued, in a high degree, their personal appearance, and have likewise regarded the appearance of others. The face has been the chief object of attention, though, when man aboriginally went naked, the whole surface of his body would have been attended to. Our self-attention is excited almost exclusively by the opinion of others, for no person living in absolute solitude would care about his appearance. Everyone feels blame more acutely than praise. Now, whenever we know, or suppose, that others are depreciating our personal appearance, our attention is strongly drawn toward ourselves, more especially to our faces. The probable effect of this will be, as has just been explained, to excite into activity that part of the sensorium which receives the sensory nerves of the face; and this will react through the vaso-motor system on the facial capillaries. By frequent reiteration during numberless generations, the process will have become so habitual, in association with the belief that others are thinking of us, that even a suspicion of their depreciation suffices to relax the capillaries, without any conscious thought about our faces. With some sensitive persons it is enough even to notice their dress to produce the same effect. Through the force, also, of association and inheritance our capillaries are relaxed, whenever we know, or imagine, that anyone is blaming, though in silence, our actions, thoughts, or character; and, again, when we are highly praised.’

'On this hypothesis we can understand how it is that the face blushes more than any other part of the body.’ 'Of all expressions, blushing seems to be the most strictly human.’ 'But it does not seem possible that any animal, until its mental powers had been developed to an equal or nearly equal degree with those of man, would have closely considered and been sensitive about its own personal appearance. Therefore we may conclude that blushing originated at a very late period in the long line of our descent.’[2]

I hold that this explanation of blushing is no longer tenable, and I think that perhaps Darwin himself would have accepted mine, since it seems to me truer, more in correspondence with the theory of evolution, more Darwinian, if I may be allowed the expression.

But why do we blush? some will ask, who insist on penetrating to the root of things. Why, under certain conditions, does the blood flow more abundantly into the rabbit’s ear and the human face? The answer to this question will be better understood when I have shown that the brain also becomes redder after an emotion. For the maintenance of life it is necessary that a dilatation of the blood-vessels should take place in all those organs in which a disturbance occurs. We all know that when our hand has been firmly squeezed, or when we have received a blow or contusion, the skin reddens at once. This change in the circulation is indispensable, for the more copious flow of blood to that part which has suffered an arrest of nutrition serves to renew the vital processes and to repair the damage caused by the injury. The same phenomena appear in the brain under psychic conditions. Emotion occasions greater energy in the chemical processes of the brain; there is a modification in the nutrition of the cells, the nervous force is more rapidly consumed, and therefore the expansion of the blood-vessels of head and brain tend, by a more abundant supply of blood, to preserve the activity of the nerve-centres.

It is in the tissues, in the properties of the living substances which constitute the vital machine, that we must seek the reasons of numerous phenomena which Darwin deduced from external causes, natural selection or environment. We shall endeavour to confine within much narrower limits the effects of chance, will, and accident, which play such an important part in Darwin’s theory. Nothing is the result of a creative force serving a premeditated end; organisms have formed and changed themselves through causes exclusively mechanical. Work perfects organisms, and the operative parts undergo, through their own activity, far-reaching modifications, which render their structure still more perfect.