Civilized races are distinguished from barbaric by the formation of states with an extensive division of labor. The social organism is not only larger and more powerful, but is capable of a greater variety of achievements, the functions of the various states and classes of workers being more highly differentiated and mutually complementary (like the cells and tissues in the higher animal body of the metazoa). Nutrition is easier and more luxurious. Art and science are well developed. A great advance is seen in regard to religion, the numerous gods being generally conceived as manlike spirits, and finally subordinated to a chief god. The belief in miracles flourishes greatly in poetry; in philosophy it is more and more restricted. In the end, the working of miracles is limited monotheistically to one god, or to his priests and other men to whom he communicates the power. Modern civilization in the narrower sense, as a contrast to the older civilization, opens, in my opinion, at the beginning of the sixteenth century. At that time took place some of the greatest achievements of human thought among civilized peoples, and these broke the chains of tradition and gave a fresh impetus to progress. Men's own mental outlook was widened by the system of Copernicus and the Reformation freed them from the yoke of the papacy. Shortly before, the discovery of the New World and the circumnavigation of the globe had convinced men of the rotundity of the earth; geography, natural history, medicine, and other sciences gained inspiration and independence; printing and engraving provided an important means of spreading the new knowledge. This fresh impetus was chiefly of service to philosophy, which now more and more rejected the dictation of the Church and superstition; though it was far from casting off the fetters altogether. This was not generally possible until the nineteenth century, when empirical science assumed an enormous importance, and in the ensuing period of speculation the physical conception of the world gained more and more on the metaphysical. Pure knowledge, thus grounded on science, entered into sharper conflict than ever with religious faith. If, as in the preceding cases, we distinguish three stages in the development of modern civilization, we recognize the progressive liberation from superstition by scientific knowledge.