The prevalent conception that the present family form has existed since times immemorial and must continue to exist lest our entire civilization be endangered--a conception that is vehemently defended by the upholders of things as they are--has been proven faulty and untenable by the researches of these scientists. The study of primeval history leaves no doubt as to the entirely different relation of the sexes at an early period of human development from their present relation, and when viewed in the light of our present-day conceptions, they seem a monstrosity, a mire of immorality. But as each stage in social development has its own methods of production, thus each stage also has its own code of morals, ~which is only a reflection of its social conditions~. Morals are determined by custom, and customs correspond to the innermost nature, that is, to the social necessities of any given period. Morgan arrives at the conclusion that in the lowest stage of savagery unrestricted sexual intercourse existed within the tribe, so that all the women belonged to all the men and all the men belonged to all the women; that is, a condition of promiscuity. All men practice polygamy, and all women practice polyandry; there is a common ownership of wives and husbands as also a common ownership of the children. Strabo relates (66 B. C.) that among the Arabs brothers have sexual intercourse with their sisters and sons with their mothers. Incest was originally a requirement to make it possible for human beings to multiply. This explanation must especially be resorted to if we accept the biblical story of the origin of man. The Bible contains a contradiction in regard to this delicate subject. It relates that Cain, having killed his brother Abel, fled from the presence of the Lord and lived in the land of Nod. There Cain knew his wife and she conceived and bore a son unto him. But whence came his wife? Cain’s parents were the first man and woman. According to the Hebrew tradition, two sisters were born to Cain and Abel, with whom they begot children. The Christian translators of the Bible appear to have suppressed this unpleasant fact. That promiscuity prevailed in a prehistoric stage, that the primeval horde was characterized by unrestricted sexual intercourse, is also shown in the Indian myth that Brama wedded his own daughter Saravasti. The same myth is met with among the Egyptians and in the Norse “Edda.” The Egyptian god Ammon was the husband of his mother and boasted of the fact, and Odin, according to the “Edda” was the husband of his own daughter Frigga.[3] Dr. Adolf Bastian relates: “In Swaganwara the daughters of the Rajah enjoyed the privilege of freely choosing their husbands. Four brothers who settled in Kapilapur made Priya, the eldest of their five sisters, queen mother and ~married the others~.”[4]