By the law of the Three Stages, so elaborately set forth by Auguste Comte, we are told that every science, each branch of knowledge, passes through three different theoretical conditions; the theological, or mythical; the metaphysical, or speculative; and the positive or scientific. “Hence,” said Comte, “arises three philosophies, or general systems of conceptions on the aggregate of phenomena, each of which excludes the other. The first is the necessary point of departure of the human understanding; and the third is its fixed, or definite, state; the second is merely a state of transition.” […]