“In this connection,” continues _Ribbing_, “we must bear in mind, that blood-relationship is not the only matter that has to be considered; in the interest alike of the family, and of society, it is necessary to demand that certain degrees of relationship by marriage alone, should fall within the ‘prohibited degrees’ of love and marriage. There are certain groups related by marriage and held together by the bond of affection, from which foster-parents and guardians may most suitably be selected to fulfil the duties as regards education and training of children who have been orphaned in early years. For such a purpose none seem better adapted than the brothers and sisters of the deceased parents; but the upbringing of the children can be confidently entrusted to the former only if the relationship between the older and the younger branches of the family is one regarded by law, and still more by morality and custom, as one precluding the possibility of the occurrence of sexual love and marriage.” _Möbius_, writing on “The Ennobling of the Human Race by Selection in Marriage,” observes: “The most important aim of natural development is the perfection of humanity. The qualities of the coming generation depend for the most part upon the qualities of the parents. Marriage from affection ensures the fulfilment of nature’s aims with more security than marriage from reason; since what we have to think of is not the happiness of the married pair but the quality of their children. Of great importance, also, to the development of the human race are the conditions during the commencement of life, and the mode of education. The improvement of the race has not hitherto been the conscious aim of the generality of people. The law does not as yet, as it should, take into account the advantage of posterity. Capital punishment is fully justified and purposive. Criminals should not be allowed to marry. The perpetuation of disease by inheritance should be checked by the utmost powers of the state. Any one marrying while suffering from any venereal disease still in an infective condition should be punished. The marriage of persons suffering from tuberculosis should be prohibited. For the prevention of disease is more important than its cure. The most important factor in preventive medicine is an improvement in the conditions of life. The human ideal should be, goodness of heart in association with physical and mental health. Goodness, beauty, and strength should be simultaneously pursued. Since, however, man is made by birth far more than by education, selection in marriage is of fundamental importance. In the choice of a partner, attention is rightly paid to beauty, since beauty and health are fundamentally identical; moreover, a human being endowed with beauty is usually also more moral than one devoid of that attribute. Equality of birth is as a rule desirable in marriage; but not the family only is to be considered in