The Earth is producing its own warmth by friction in its atmosphere the same as a wagon-wheel would do by being rapidly revolved inside of a loose tire. The atmosphere is virtually a tire surrounding us, through which the Earth revolves, and by Friction produces the warmth as really as a man warms his hands by rubbing them together. That the Sun can be an inconsumable body of fire, or that it can become extinct is a most preposterous belief. That the Sun is a vast body of earth and water hardly admits of a doubt, and its warmth and light is due to the same influence largely that the Earth and every other planet experiences. There is not and cannot be a complete consumption of material in the immutable affairs of Nature, as there must be an eternal and exhaustless interchange of supply and demand. While our forest and other fuel supply is being burned, another is growing and something forming to keep up the balance. In Nature nothing is lost, neither can there be increase; design is limitless, and resources inexhaustible; duplicates are never known in form, species, features, and thoughts; thus showing one of Nature’s most positive laws, that mankind shall not accept one central thought, creed, or purpose to be universally followed, as such an order of things would entirely preclude the writing of the few hints herein offered, as the encouragement of any new device for man’s benefit of body or mind, thus leaving everything in a state of stagnation wherein thrift, learning, and progress would be unknown. Nature never repeats her works, and no two grains of sand or flakes of snow have ever been exactly alike, or ever motionless. Motion causes friction. Friction produces heat. Heat produces life. XVII. SCIENTIFIC THEORIES.