But does psychical research lie outside the domain of physical science? What is the supernatural but the higher workings of laws which we call natural, as far as we have been able to investigate them? Is not the supernatural, then, just as legitimate a subject of consideration, for the truly scientific mind, as is the natural? If it explains, satisfactorily, phenomena which cannot be otherwise explained, there is no good reason why its aid should not be invoked by men of science. The truth is, that the ordinary course of nature is one continued miracle, one continued manifestation of the Divine mind. "Everything which is, is thought," says Amiel, "but not conscious and individual thought. Everything is a symbol of a symbol; and a symbol of what?--of mind. We are hemmed round with mystery, and the greatest mysteries are contained in what we see, and do, every day." Keely affirms, with other philosophers, that there is only one unique substance, and that this substance is the Divine spirit, the spirit of life, and that this spirit of life is God, who fills everything with His thoughts; disjoining and grouping together these multitudes of thoughts in different bodies called atmospheres, fluids, matters, animal, vegetable, and mineral forms. Herbert Spencer says that amid the mysteries that become the more mysterious the more they are thought about, there will remain the one absolute certainty, that we are ever in the presence of an infinite and an eternal energy, from which all things proceed. Macvicar foreshadowed the teachings of this new philosophy when he wrote, "All motion in the universe is rhythmical. This is seen in the forward and backward movement of the pendulum, the ebb and the flow of the tides, the succession of day and night, the systolic and diastolic action of the heart, and in the inspiration and expiration of the lungs. Our breathing is a double motion of universal æther, an active and a reactive movement. This androgyne principle, with its dual motion, is the breath of God in man." The writings of the ancients teem with these ideas, which have been handed down to us from generation to generation, and are now flashing their light, like torches in the darkness, upon mysteries too long regarded as "lying outside the domains of physical science."