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Rh whether we will have aristocratic institutions or democratic institutions. It is believed that statesmen can, if they will, put a people in the way of material prosperity. It is believed that rent on land can be abolished if it is not thought expedient to have it. It is assumed that peasant proprietors can be brought into existence anywhere where it is thought that it would be an advantage to have them. These illustrations might be multiplied indefinitely. They show the need of sociology, and if we should go on to notice the general conceptions of society, its ills and their remedies, which are held by various religious, political, and social sects, we should find ample further evidence of this need.

Let us then endeavor to define the field of sociology. Life in society is the life of a human society on this earth. Its elementary conditions are set by the nature of human beings and the nature of the earth. We have already become familiar, in biology, with the transcendent importance of the fact that life on earth must be maintained by a struggle against nature, and also by a competition with other forms of life. In the latter fact biology and sociology touch. Sociology is a science which deals with one range of phenomena produced by the struggle for existence, while biology deals with another. The forces are the same, acting on different fields and under different conditions. The sciences are truly cognate. Nature contains certain materials which are capable of satisfying human needs, but those materials must, with rare and mean exceptions, be won by labor, and must be fitted to human use by more labor. As soon as any number of human beings are struggling each to win from nature the material goods necessary to support life, and are carrying on this struggle side by side, certain social forces come into operation. The prime