=Everything Suggestive.= Human beings are constantly communicating, one to another. Sometimes they "get over" an idea by means of words, but often they do it in more subtle ways,--by the elevation of an eyelid, the gesture of a hand, composure of manner in a crisis, or a laugh in a delicate situation. A suggestion is merely an idea passed from one person to another, an idea that is accepted with conviction and acted upon, even though there may be no logic, no reason, no proof of its truth. It is an influence that takes hold of the mind and works itself out to fulfilment, quite apart from its worth or reasonableness. Of course, logical persuasion and argument have their place in the communication of ideas; an idea may be conveyed by other ways than suggestion. But while suggestion is not everything, it is equally true that there is suggestion in everything. The doctor may give a patient a very rational explanation of his case, but the doubtful shake of the head or the encouraging look of his eye is quite likely to color the patient's general impression. The eyes of our subconscious are always open, and they are constantly getting impressions, subtle suggestions that are implied rather than expressed. =Abnormal Suggestibility.= While everybody is suggestible, nervous people are abnormally so. It may be, as McDougall suggests, that they have so large an amount of submission or negative self-feeling in their make-up that they believe anything, just because some one else says it is true. Sometimes it is lack of knowledge that makes us gullible, and at other times the cause of our suggestibility is failure to use the knowledge that we have. Sometimes our ideas are locked away in air-tight compartments with no interaction between them. The psychologists tell us that suggestion is greatly favored by a narrowing of the attention, a "contraction of the field of consciousness," a dissociation of other ideas through concentration. This all simply means that we forget to let our common sense bring to bear counter ideas that might challenge a false one; or that worry--a veritable "spasm of the attention"--has fixed upon an idea to the exclusion of all others; or that through fatigue or the dissociation of sleep or hypnosis or hysteria, our reasoning powers have been locked out and for the time being are unable to act.