1. THE CONSANGUINE FAMILY.
The Consanguine Family is the first step toward the family. Here the marriage groups are arranged by generations: all the grand-fathers and grand-mothers within a certain family are mutually husbands and wives; and equally their children, the fathers and mothers, whose children form a third cycle of mutual mates. The children of these again, the great-grandchildren of the first cycle, will form a fourth. In this form of the family, then, only ancestors and descendants are excluded from what we would call the rights and duties of marriage. Brothers and sisters, male and female cousins of the first, second and more remote grades, are all mutually brothers and sisters and for this reason mutual husbands and wives. The relation of brother and sister quite naturally includes at this stage the practice of sexual intercourse.12
The typical form of such a family would consist of the offspring of one pair, representing again the descendants of each grade as mutual brothers and sisters and, therefore, mutual husbands and wives. The consanguine family is extinct. Even the crudest nations of history do not furnish any proofs of it. But the Hawaiian system of kinship, in force to this day in all Polynesia, compels us to acknowledge its former existence, for it exhibits grades of kinship that could only originate in this form of the family. And the whole subsequent development of the family compels us to admit this form as a necessary step.
2. THE PUNALUAN FAMILY.
While the first step of organization consisted in excluding parents and children from mutual sexual intercourse, the second was the erection of a barrier between brother and sister. This progress was much more important on account of the greater equality in the ages of the parties concerned, but also far more difficult. It was accomplished gradually, probably beginning with the exclusion of the natural sister (i. e., on the