It cannot be too often repeated that evolution, development, are intellectual and rational concepts-the Western world's form of an intelligible world. We have but to show the place of a thing in this process to make it intelligible. An evolutional philosophy is thus essentially a systematic philosophy. But evolution is an idea, a concept, a category if you will. As such, it must itself be made understandable, intelligible. That prevailing concepts of evolution are not always found to be intelligible is clear enough from the revolt against evolution in high places as weH as low. "The world, my dear friend, does not evolve," says D. H. Lawrence, in his Philosophy of the Unconscious. Many there are who think that the world itself does not evolve, and some who, like Tolstoy, do not think that evolution is even the fundamental character of things within the world. Many others hold that certain formulas or concepts of evolution are untrue and unintelligible. Darwinian evolution, with its "circumstantial selection," is frankly caHed nonsense, and cosmic evolution of the Spencerian type is without hesitation described as one of the m03t unintelligible l'hilosophies ever invented. An intelligible concept of evolution is plainly the great desideratum of the modern world.