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A more difficult book to swing into would be hard to find. It concerns the bringing of the artistic intuition of the soul into the scientific world: Its subject matter is ecstasy, passion, the unplumbed depths of human personality. Art and religion must bring their treasures to science. It would be hard, indeed, for the neurologist to get any hold of psycho-expedition if it were not for its criticisms of psychoanalysis and experimental psychology. The latter is dismissed as disregarding, essentially, everything but the normal consciousness. The former concerns itself with primitive instinctive life, shutting its eyes to everything else, and even in its own field "interprets" instead of observing.
What the book claims is that it begins the science of man in his infinite multiformity. What it emphasizes is a psychic life of three modes, "which alternately flow into each other" —the primitive, the normal conscious and