Finally the Unconscious plays the part of supervisor over our physical processes. Digestion, assimilation, the circulation of the blood, the action of the lungs, the kidneys and all the vital organs are controlled by its agency. Our organism is not a clockwork machine which once wound up will run of itself. Its processes in all their complexity are supervised by mind. It is not the intellect, however, which does this work, but the Unconscious. The intellect still stands aghast before the problem of the human body, lost like Pascal in the profundities of analysis, each discovery only revealing new depths of mystery. But the Unconscious seems to be familiar with it in every detail. It may be added that the Unconscious never sleeps; during the sleep of the conscious it seems to be more vigilant than during our waking hours. In comparison with these, the powers of the conscious mind seem almost insignificant. Derived from the Unconscious during the process of evolution, the conscious is, as it were, the antechamber where the crude energies of the Unconscious are selected and adapted for action on the world outside us. In the past we have unduly exaggerated the importance of the conscious intellect. To claim for it the discoveries of civilisation is to confuse the instrument with the agent, to attribute sight to the field-glass instead of to the eye behind it. The value of the conscious mind must not be underrated, however. It is a machine of the greatest value, the seat of reason, the social instincts and moral concepts. But it _is_ a machine and not the engine, nor yet the engineer. It provides neither material nor power. These are furnished by the Unconscious. These two strata of mental life are in perpetual interaction one with the other. Just as everything conscious has its preliminary step in the Unconscious, so every conscious thought passes down into the lower stratum and there becomes an element in our being, partaking of the Unconscious energy, and playing its part in supervising and determining our mental and bodily states. If it is a healthful thought we are so much the better; if it is a diseased one we are so much the worse. It is this transformation of a thought into an element of our life that we call Autosuggestion. Since this is a normal part of the mind's action we shall have no difficulty in finding evidence of it in our daily experiences.