The faculties that lie beyond the violet end of our psychological spectrum will need more delicate exhibition and will command a less ready belief. The actinic energy which lies beyond the violet end of the solar spectrum is less obviously influential in our material world than is the dark heat which lies beyond the red end. Even so, one may say, the influence of the ultra-intellectual or supernormal faculties upon our welfare as terrene organisms is less marked in common life than the influence of the organic or subnormal faculties. Yet it is that prolongation of our spectrum upon which our gaze will need to be most strenuously fixed. It is there that we shall find our inquiry opening upon a cosmic prospect, and inciting us upon an endless way.
Even the first stages of this progress are long and labyrinthine; and it may be useful to conclude this introductory chapter by a brief summary of the main tracts across which our winding road must lie. It will be my object to lead by transitions as varied and as gradual as possible from phenomena held as normal to phenomena held as supernormal, but which like the rest are simply and solely the inevitable results and manifestations of universal Law.
Following then on this first or introductory chapter is one containing a discussion of the ways in which human personality disintegrates and decays. Alternations of personality and hysterical phenomena generally are in this connection the most instructive to us.
In the third chapter we utilize the insight thus gained and discuss the line of evolution which enables man to maintain and intensify his true normality. What type of man is he to whom the epithet of normal,—an epithet often obscure and misleading,—may be most fitly applied? I claim that that man shall be regarded as normal who has the fullest grasp of faculties which inhere in the whole race. Among these faculties I count subliminal as well as supraliminal powers;—the mental processes which take place below the conscious threshold as well as those which take place above it; and I attempt to show that those who reap most advantage from this submerged mentation are men of genius.
The fourth chapter deals with the alternating phase through which man's personality is constructed habitually to pass. I speak of sleep; which I regard as a phase of personality, adapted to maintain our existence in the spiritual environment, and to draw from thence the vitality of our physical organisms. In this chapter I also discuss certain supernormal phenomena which sometimes occur in the state of sleep.
The fifth chapter treats of hypnotism, considered as an empirical development of sleep. It will be seen that hypnotic suggestion intensifies the physical recuperation of sleep, and aids the emergence of those supernormal phenomena which ordinary sleep and spontaneous somnambulism sometimes exhibit.
From hypnotism we pass on in the sixth chapter to experiments, less familiar to the public than those classed as hypnotic, but which give a still further insight into our subliminal faculty. With these experiments are intermingled many spontaneous phenomena; and the chapter will take up and continue the spontaneous phenomena of Chapters III. and IV. as well as the experiments of Chapter V. Its theme will be the messages which the subliminal self sends up to the supraliminal in the form of sensory hallucinations:—the visions fashioned internally, but manifested not to the inward eye alone; the voices which repeat as though in audible tones the utterance of the self within.
These sensory automatisms, as I have termed them, are very often telepathic—involve, that is to say, the transmission of ideas and sensations from one mind to another without the agency of the recognised organs of sense. Nor would it seem that such transmission need necessarily cease with the bodily death of the transmitting agent. In the seventh chapter evidence is brought forward to show that those who communicated with us telepathically in this world may communicate with us telepathically from the other. Thus phantasms of the dead receive a new meaning from observations of the phenomena occurring between living men.
But besides the hallucinatory hearing or picture-seeing which we have classed as sensory automatisms, there is another method by which the subliminal may communicate with the supraliminal self.
In Chapter VIII., we consider in what ways motor automatism—the unwilled activity of hand or voice—may be used as a means of such communication. Unwilled writings and utterances furnish the opportunity for experiment more prolonged and continuous than the phantasms or pictures of sensory automatism can often give, and, like them, may sometimes originate in telepathic impressions received by the subliminal self from another mind. These motor automatisms, moreover, as the ninth chapter shows, are apt to become more complete, more controlling, than sensory automatisms. They may lead on, in some cases, to the apparent possession of the sensitive by some extraneous spirit, who seems to write and talk through the sensitive's organism, giving evidence of his own surviving identity.