Only we must not forget that it is the effect and not the cause.

At the same time it is important to remember that such a thing as reversal of the relation between cause and effect is possible, just as the same apparatus may be made to generate mechanical power by the application of electricity, or to generate electricity by the application of mechanical power. And the importance of this principle consists in this. There is always a tendency for actions which were at first voluntary to become automatic, that is, to pass from the region of conscious mind into that of subconscious mind, and to acquire a permanent domicile there. Professor Elmer Gates, of Washington, has demonstrated this physiologically in his studies of brain formation. He tells us that every thought produces a slight molecular change in the substance of the brain, and the repetition of the same sort of thought causes a repetition of the same molecular action until at last a veritable channel is formed in the brain substance, which can only be eradicated by a reverse process of thought. In this way "grooves of thought" are very literal things, and when once established the vibrations of the cosmic currents flow automatically through them and thus react upon the mind by a process the reverse of that by which our voluntary and intentional indrawing from the invisible is affected. In this way are formed what we call "habits," and hence the importance