of blood in our bodies into the lists in which phagocyte and microbe wage the mortal strife on which our health depends. Every white corpuscle that swims in our veins is now declared to be the armed Knight of Life for ever on the look-out for the microbe Fiend of Death. Day and night, sleeping and waking, the white knights of life are constantly on the alert, for on their vigilance hangs our existence. Sometimes, however, the invading microbes come in, not in companies but in platoons, innumerable as Xerxes' Persians, and then "e'en Roderick's best are backward borne," and we die. For our life is the prize of the combat in these novel lists which science has revealed to our view through the microscope, and health is but the token of the triumphant victory of the phagocyte over the microbe.
But far more enthralling is the suggestion which psychical science has made as to the existence of a combat not less grave in the very inmost centre of our own mental or spiritual existence. The strife between the infinitely minute bacilli that swarm in our blood has only the interest which attaches to the conflict of inarticulate and apparently unconscious animalcul?. The strife to which researches into the nature and constitution of our mental processes call attention concerns our conscious selves. It suggests almost inconceivable possibilities as to our own nature, and leaves us appalled on the brink of a new world of being of which until recently most of us were unaware.
There are no papers of such absorbing interest in the whole of the "Proceedings of the Society for Psychical Research" as those which deal with the question of the Personality of Man. "I," what am I? What is our Ego? Is this Conscious Personality which receives impressions through the five senses, and through them alone, is it the only dweller in this mortal tabernacle? May there not be other personalities, or at least one other that is not conscious, when we are awake, and alert, and about, but which comes into semi-consciousness when we sleep, and can be developed into complete consciousness when the other personality is thrown into a state of hypnotic trance? In other words, am I one personality or two? Is my nature dual? As I have two hemispheres in my brain, have I two minds or two souls?
The question will, no doubt, appear fantastic in its absurdity to those who hear it asked for the first time; but those who are at all familiar with the mysterious but undisputed phenomena of hypnotism will realize how naturally this question arises, and how difficult it is to answer it otherwise than in the affirmative. Every one knows Mr. Louis Stevenson's wonderful story of "Dr. Jekyll and Mr. Hyde." The dual nature of man, the warfare between this body of sin and death, and the spiritual aspirations of the soul, forms part of the common stock of our orthodox belief. But the facts which recent researches have brought to light seem to point not to the old theological doctrine of the conflict between good and evil in one soul, but to the existence in each of us of at least two distinct selfs, two personalities, standing to each other somewhat in the relation of man and wife, according to the old ideal when the man is everything and the woman is almost entirely suppressed.
Every one is familiar with the phenomenon of occasional loss of memory. Men are constantly losing consciousness, from disease, violence, or violent emotion, and emerging again into active life with a gap in their memory. Nay, every night we become unconscious in sleep, and rarely, if ever, remember anything that we think of during slumber. Sometimes in rare cases there is a distinct memory of all that passes in the sleeping and the waking states, and we have read of one young man whose sleeping consciousness was so continuous that he led, to all intents and purposes, two lives. When he slept he resumed his dream existence at the point when he waked, just as we resume our consciousness at the point when we fall asleep. It was just as real to him as the life which he lived when awake. It was actual, progressive, continuous, but entirely different, holding no relation whatever to his waking life. Of his two existences he preferred that which was spent in sleep, as more vivid, more varied, and more pleasurable. This was no doubt an extreme and very unusual case. But it is not impossible to conceive the possibility of a continuous series of connected dreams, which would result in giving us a realizing sense of leading two existences. That we fail to realize this now is due to the fact that our memory is practically inert
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