This same repulsive theorist of the most abandoned anti-social ego-mania denies also that one can speak of a mind as diseased or healthy. ‘There is,’ he says,[274] ‘from the metaphysical observer’s point of view, neither disease nor health of the soul; there are only psychological states, for he perceives in our sufferings and in our faculties, in our virtues and in our vices, in our volitions and in our renunciations, only changing combinations, inevitable, and therefore normal, subject to the known laws of the association of ideas. Only prejudice, in which the ancient doctrine of final causes and the belief in the definite aim of the universe reappear, can make us consider the loves of Daphnis and Chloë in the valley as natural and healthy, and the loves of a Baudelaire as artificial and unwholesome.’

To bring this silly sophistry down to its just value, common-sense has only to recollect the existence of lunatic asylums. But common-sense has not the right of suffrage among the rhetoricians of M. Paul Bourget’s stamp. We reply to him, then, with a seriousness he does not merit, that in fact every vital manifestation, those of the brain as of any other organ, is the necessary and only possible effect of the causes which occasion them, but that, according to the state of the organ and of its elementary parts, its activity, necessary and natural as such, can be useful or hurtful to the whole organism. Whether the world has a purpose is a question that can altogether be left indecisive, but the activity of each part of the organism has nevertheless, if not the aim, at least unquestionably the effect, of preserving the whole organism; if it does not produce this effect, and if, on the contrary, it thwarts it, it is injurious to the whole organism, and for such an injurious activity of any particular organ language has coined the word ‘disease.’ The sophist who denies that there may be disease and health must also logically deny that there may be life and death, or, at least, that death may have some sort of importance. For, as a matter of fact, given a certain activity of its parts which we call morbid, the organism perishes, while with an activity of another nature, which we qualify as healthy, it lives and thrives. As long, then, as Bourget does not lay down the dogma that pain is as agreeable as pleasure, decrepitude as satisfactory as vigour, and death as desirable as life, he proves that he does not know, or dares not draw from his premise, the just conclusion which would immediately make the absurdity of it apparent.

The whole theory which must explain and justify the predilection for evil has, besides, been invented as an after-thought. The inclination for what is evil and disgusting existed first, and was not a consequence of philosophical considerations and self-persuasion. We have here merely another case of that method of our consciousness, so often attested in the course of these inquiries, which consists of inventing rational causes for the instincts and acts of the unconscious.

In the predilection of the Parnassians for the immoral, criminal and ugly, we have to deal merely with an organic aberration, and with nothing else. To pretend that inclinations of this kind exist in all men, even in the best and sanest, and are merely stifled by him, while the Parnassians give the rein to theirs, is an arbitrary and unproved assertion. Observation and the whole march of the historical development of humanity contradict it.

There may be repulsion and attraction in nature—no one denies it. A glance at the magnetic poles, at the positive and negative electrodes, suffices to establish this fact. We find this phenomenon again among the lowest forms of life. Certain materials attract, others repel them. There is no question here of an inclination or an expression of the will. We must rather consider the process as purely mechanical, having its reason probably in molecular relations which are still unknown to us. Microbiology gives to the attitude of micro-organisms towards attractive and repulsive matter the name of ‘chemotaxis’ or chimiotaxia, invented by Pfeffer.[275] In higher organisms the conditions are naturally not so simple. Among them also, it is true, the ultimate cause of inclinations and aversions is certainly chimiotactic, but the effect of chimiotaxia must necessarily manifest itself under another form. A simple cell such as a bacillus, for example, is repelled directly when it penetrates into the radius of a chimic body which repels it. But the cell constituting a portion of a higher organism has not this liberty of movement. It cannot change its place independently. If it is now chimiotactically repelled, it cannot escape from the pernicious action, but must remain exposed to it, and submit to the disturbances in its vital activity. If these are sufficiently serious to injure the functions of the whole organism, the latter obtains knowledge of it, endeavours to perceive their cause, discovers it also, as a general rule, and does for the suffering cell what the latter cannot do alone, namely, shields it from the repelling action. The organism necessarily acquires experience in its defence against pernicious influences. It learns to know the circumstances in which they appear, and no longer permits matters to reach the stage of the really chimiotactic effect, but for the most part evades disturbing matters before they can exert a really direct repulsion. The knowledge acquired by the individual becomes hereditary, transforms itself into an organized faculty of the species, and the organism feels subjectively, as a discomfort which may amount to pain, the warning that a pernicious influence is acting upon it, and that it has to avoid it. To escape from pain becomes one principal function of the organism, which it cannot insufficiently provide against or neglect without expiating that negligence by its ruin.

In the human being processes take place not otherwise than as they have been here described. The hereditary organized experience of the species warns him of the noxiousness of influences to which he is frequently exposed. His outposts against naturally hostile forces are his senses. Taste and smell give him, as to repulsive chimiotactic matter, the impressions of nausea and of stench; the different kinds of skin-sensations make him aware, through sensations of pain, heat, or cold, that a given contact is unfavourable to him; eye and ear place him on his guard, by loud, shrill, discordant sensations, against the mechanical effects of certain physical phenomena. Finally, the higher cerebral centres respond to recognised noxious influences of a composite nature, or to the representation of them by an equally composite reaction of aversion in different degrees of intensity, from simple discomfort to horror, indignation, dismay, or fury.

The vehicle of this hereditary, organized, racial experience is the unconscious life; to it is confided defence against simple, frequently recurring noxious influences. Nausea at intolerable tastes, repugnance to insufferable smells, the fear of dangerous animals, natural phenomena, etc., have become for it an instinct to which the organism abandons itself without reflection—i.e., without the intervention of consciousness. But the human organism learns to distinguish and avoid not only all that is directly prejudicial to itself; it acts in the same way with regard to that which menaces it not as an individual, but as a racial being, as a member of an organized society; antipathy to influences injurious to the maintenance or prosperity of the society becomes in him an instinct. But this enriching of organized unconscious cognition represents a higher degree of development than many human beings attain to. The social instincts are those that a man acquires last of all, and, in conformity to a known law, he loses them first when he retrogrades in his organic development.

Consciousness has occasion to declare the dangerous nature of phenomena, and to defend the organism against it, only if these phenomena are either quite new, or very rare, so that they cannot be hereditarily recognised and dreaded; or if they enclose in themselves many different elements, and do not act directly, but only by their more or less remote consequences, so that to know them exacts a complex activity of representation and judgment.

Thus aversion is always the instinctive, or conscious cognition of a noxious influence. Pleasure, its opposite, is not merely, as has been sometimes maintained, the absence of discomfort—i.e., a negative state—but something positive. Every part of the organism has definite needs which assert themselves as a conscious or unconscious tendency, as an inclination or appetite; the satisfaction of these needs is felt as a pleasure which can rise to a feeling of bliss. The first need of each organ is to manifest itself in activity. Its simple activity is a source of pleasure to it, so long as it does not go beyond its powers. The activity of the cerebral centres consists in receiving impressions, and in transforming them into representations and movements. This activity produces in them feelings of pleasure; they have in consequence a strong desire to receive impressions so as to be put into activity by them, and experience feelings of pleasure.

This, broadly sketched, is the natural history of the feelings of pleasure and pain. The reader who has mastered it will experience no difficulty in comprehending the nature of aberration.