But, perhaps, the chief conclusion to be derived from hypnotic experience is the value of suggestion or suggestibility. Even cool thinkers like Kant have recognised how much mere mental control has to do with bodily state,—how each of us, in this way, is often for good or for ill his own physician. An idea is a force, and is only inactive in so far as it is held in check by other ideas. “There is no such thing as hypnotism,” says one: “there are only different degrees of suggestibility.” This may be to exaggerate: yet it serves to impress the comparatively secondary character of many of the circumstances on which the specially mesmeric or hypnotic experimentalist is apt to lay exclusive stress. The methods may probably vary according to circumstances. But the essence of them all is to get the patient out of the general frame and system of ideas and perceptions in which his ordinary individuality is encased. Considering how for all of us the reality of concrete life is bound up with our visual perceptions, how largely our sanity depends upon the spatial idea, and how that depends on free ocular range, we can understand that darkness and temporary loss of vision are powerful auxiliaries in the hypnotic process, as in magical and superstitious rites. But a great deal short of this may serve to establish influence. The mind of the majority of human beings, but especially of the young, may be compared to a vacant seat waiting for some one to fill it. In Hegel’s view hypnotic phenomena produce a kind of temporary and artificial atavism. Mechanical or chemical means, or morbid conditions of body, may cause even for the intelligent adult a relapse into states of mind closely resembling those exhibited by the primitive or the infantile sensibility. The intelligent personality, where powers are bound up with limitations and operate through a chain of means and ends, is reduced to its primitively undifferentiated condition. Not that it is restored to its infantile simplicity; but that all subsequent acquirements operate only as a concentrated individuality, or mass of will and character, released from the control of the self-possessed mind, and invested (by the latter’s withdrawal) with a new quasi-personality of their own. With the loss of the world of outward things, there may go, it is supposed, a clearer perception of the inward and particularly of the organic life. The Soul contains the form of unity which other experiences had impressed upon it: but this form avails in its subterranean existence where it creates a sort of inner self. And this inner self is no longer, like the embodied self of ordinary consciousness, an intelligence served by organs, and proceeding by induction and inference. Its knowledge is not mediated or carried along specific channels: it does not build up, piecemeal, by successive steps of synthesis and analysis, by gradual idealisation, the organised totality of its intellectual world.