SOME GENERAL CONCLUSIONS, both of theoretical and practical bearing, may here be pointed out. We have seen that the biological processes of life have created the family, and that the family, as an institution, rests upon these biological conditions. Hence it is not too much to say, first, that the family is not a man-made institution; and, secondly, that it rests upon certain fundamental instincts of human nature. Now, both of these statements are also true to a certain extent as to human society in general. There is a sense in which social organization is not wholly man-made, and it is true that all human institutions rest to some extent upon human instincts. This is not saying, of course, that man has not modified and may not modify social organization and human institutions through his reason, but it is saying that the essential elements in human institutions and in the social order must correspond to the conditions of life generally and to the instincts which natural selection has implanted in the species. To attempt to reorganize human society or to reconstruct institutions regardless of the biological conditions of life, or regardless of human instincts, is to meet with certain failure. A practical conclusion which may be drawn also is that those people who advocate sexual promiscuity in present society, or free love, as they please to style it, are advocating a condition which would result in the elimination of any group that practiced it. Promiscuity, or even great instability in the family life, as we have already seen, would lead to the undermining of everything upon which a higher civilization rests. The people in modern society who advocate such theories as free love, therefore, are more dangerous than the worst anarchist or the most revolutionary socialist. In other words, the modern attack upon the family is more of a menace to all that is worth while in human life than all attacks upon government and property, although it is not usually resented as such; and it is one of the most serious signs of the times that many intellectual people have indorsed such views. We must reemphasize, therefore, the fact that the family is the central institution of human society, that industry and the state must subordinate themselves to its interest. Neither the state nor industry has had much to do with the origin of the family, and neither the state nor industry may safely determine its forms independent of the biological requirements for human survival. Moreover, it is evident that human society from the beginning has in more or less instinctive, and also in more or less conscious, ways attempted to regulate the relations between the sexes with a view to controlling the reproductive process. While material civilization is mainly a control over the food process, moral civilization involves a control over the reproductive process, that is, over the birth and rearing of children; and such control over