At a later date (1857) Schindler, in his “Magical Spirit-life,” expounded a theory of mental polarity. The psychical life has two poles or centres,—its day-pole, around which revolves our ordinary and superficial current of ideas, and its night-pole, round which gathers the sub-conscious and deeper group of beliefs and sentiments. Either life has a memory, a consciousness, a world of its own: and they flourish to a large extent inversely to each other. The day-world has for its organs of receiving information the ordinary senses. But the magical or night-world of the soul has its feelers also, which set men directly in telepathic rapport with influences, however distant, exerted by the whole world: and through this “inner sense” which serves to concentrate in itself all the telluric forces (—a sense which in its various aspects we name instinct, presentiment, conscience) is constructed the fabric of our sub-conscious system. Through it man is a sort of résumé of all the cosmic life, in secret affinity and sympathy with all natural processes; and by the will which stands in response therewith he can exercise a directly creative action on external nature. In normal and healthy conditions the two currents of psychic life run on harmonious but independent. But in the phenomena of somnambulism, clairvoyance, and delirium, the magic region becomes preponderant, and comes into collision with the other. The dark-world emerges into the realm of day as a portentous power: and there is the feeling of a double personality, or of an indwelling genius, familiar spirit, or demon.