The social organization of primitive tribes shows similar traits in many different parts of the world. Instead of counting descent in the way we do, many tribes consider the child as a member only of its mother’s family, and count blood-relationship only in the maternal line, so that cousins on the mother’s side are considered as near relatives, while cousins on the father’s side are considered as only distantly related; other tribes have a strict paternal organization, so that the child belongs only to the father’s family, not to the mother’s; while still others follow the same principles as we adhere to, reckoning relationship in both directions. Connected with these customs is the selection of the domicile of the newly married couple, who sometimes reside with the wife’s tribe or family, sometimes with the man’s tribe or family. When the couple take up their residence with the social group to which the wife belongs, it is often found that the man is treated as a stranger until his first child is born. These phenomena have been made the subject of thorough studies, and the observation has been made that apparently the customs of residence and of descent are closely associated (Tylor). As a result of these inquiries, the conclusion has been drawn that everywhere maternal institutions precede paternal institutions, and that the social organization of mankind was such that originally perhaps no distinct family organization existed; that later on maternal institutions developed, which in turn were followed by paternal institutions, and again by the system of counting blood-relationship equally in maternal and paternal lines.