The rainbow expands its radiant circle, the rose and lily sparkle in the sunshine; the green fields and golden grain diversify the landscape by their vivid colors. But there are no colors; there is no light; there are only undulations in the air that set the optic nerve vibrating. The sun warms and fertilizes, the fire burns, but there is no heat, only the sensation of heat. Heat, like light, is only the result of motion--invisible, all-potent, supreme. Here is a solid iron joist sustaining tons of enormous weight, yet the joist is composed of molecules which do not touch each other and are in continual motion. What constitutes the solidity of this bar of iron? Not the atoms that compose it; but the cause of its solidity is molecular attraction, the invisible force of magnetic attraction. The present scientific theories have only been apprehended by the brightest intellects within the last half century, and would have been a conglomeration of absurdities to the wisest men of the world a century ago. So, written revelation had to use the language and symbols understood by the ancients. And it seems that scientific evolution is constantly struggling for new terms to express new ideas and discoveries. Some scientists believe it impossible for the terrestrial being to attain a complete knowledge of the truth because he has only five senses, and a multitude of the phenomena of nature remains unknown to his mind because he has no means by which to reach them. Just as if we should be unable to see if deprived of the optic nerve, or to hear if deprived of the auditory nerve. Our terrestrial harp may be wanting in many chords which prevent us from catching the perfect harmony and truth of the universe. It is said the smallest magnet can more easily than Newton or Leibnitz discover the magnetic pole, and the swallow has more knowledge of the varieties of latitude than had Columbus or Magellan. But whatever our experience, it is a part of the book of God and nature. Flammarion says: "No one who is aware of the progress made in the exact sciences of to-day can pretend to be a materialist. The psychic atom, the principle of the human organism would be immortal, like atoms everywhere, if scientists were to admit the fundamental axioms of chemistry. But it would be superior to atoms, and be conscious of its existence. Can the soul partake of the character of electricity? We conceive that it exists as force that survives the dissolution of the body."