Dr. Darwin's theory of evolution and selection has changed our modern mode of studying the inorganic and organic phenomena of nature, and investigating the realities of truth. His theory is not altogether new, having been first proclaimed by Leibnitz, and followed up with regard to history by Giovanni Battista Vico. Oken and Goethe amplified it towards the end of the last, and at the beginning of the present century. Darwin, however, has systematized the theory of evolution, and now the branches of human knowledge can only be advantageously pursued if we trace in all phenomena, whether material or spiritual, a beginning and a gradual development. One fact has prominently been established, that there is order in the eternal change, that this order is engendered by law, and that law and order are the criterions of an all-wise ruling Spirit pervading the Universe. To this positive spirit of law a spirit of negation, an element of rebellion and mischief, of mockery and selfishness, commonly called the Devil, has been opposed from the beginning. It appeared, till very lately, as though God had created the world only for the purpose of amusing the Devil, and giving him an abundance of work, all directed to destroying the happiness of God's finest creation--man. Treating the Devil from a Darwinian point of view, we may assert that he developed himself from the protoplasm of ignorance, and in the gloomy fog of fear and superstition grew by degrees into a formidable monster, being changed by the overheated imaginations of dogmatists into a reptile, an owl, a raven, a dog, a wolf, a lion, a centaur, a being half monkey, half man, till, finally, he became a polite and refined human being. Man once having attained a certain state of consciousness, saw sickness, evil, and death around him, and as it was usual to assign to every effect some tangible cause, man developed the abstract notion of evil into a concrete form, which changed with the varying impressions of climate, food, and the state of intellectual progress. To the white man the Devil was black, and to the black man white. Originally, then, the Devil was merely a personification of the apparently destructive forces of nature. Fire was his element. The Indians had their Rakshas and Uragas, the Egyptians their Typhon, and the Persians their Devas. The Israelites may claim the honour of having brought the theory of evil into a coarse and sensual form, and the Christians took up this conception, and developed it with the help of the Gnostics, Plato, and the Fathers dogmatically into an entity.