In fine, these men agreed that the mind, reaching back, by its very structure, to the beginning of organic life, was limited by consciousness to a comparatively small number of its potentialities, whereas its subliminal life (on the contrary) was infinite and unsearchably subtle. All minds partook, in varying degrees, of these baffling powers, but only now and then, through unusual favoring circumstances, was the brain able to manifest its depth and subtlety. Sickness, sleeplessness, physical shock, some accidental series of events now and then permitted a display of these hidden acquirements, and thereafter the individual was marked as abnormal, possessed, according to the ancient view, by angels or devils. Others still, by putting themselves deliberately into the study, had been able to subordinate the conscious mind, little by little liberating their subliminal forces by practice, attaining thus almost miraculous powers. In this way the "medium" became clairvoyant, clairaudient, telekinetic. In other cases still, as in Viola's case, this subordination of the supra-liminal self had been accomplished by the suggestion of others, by submission to the will of others. He had been profoundly instructed by Tolman's account of a case of alternating personality which he had studied with so much care. The fact that the secondary self appeared when the subject's life seemed at a lower ebb, and when the cerebral centres were sparsely supplied with the life-current, and the further fact that the use of a certain substance which stimulated (without poisoning) the higher brain-centres, was able to bring back the primary or supra-liminal self, was of the utmost value. It threw a flood of light upon Viola's condition, for had she not in her trance become inert, cold, and almost without pulse? He had provided himself with this drug, and as he studied its appearance in the phial, so minute, so colorless, so helpless in its prison, he felt once again the mystery of matter, and smiled to think how childish was the popular conception of the physical universe as something dead and inorganic. Nothing is more mysterious. "The office of this drug can be twofold. It has the power in itself to flush the cerebral centres with fresh blood, and it can also serve as a point of support for the suggestion I am about to give. It does not really matter whether she has any phase of what they call mediumistic power or not. To rid her of her trances will liberate her from a belief in her ills, and that is the main consideration."