When Morgan wrote his book, our knowledge of group marriage was very limited. We knew very little about the group marriages of the Australians organized in classes, and furthermore Morgan had published as early as 1871 the information he had received about the Punaluan family of Hawaii. This family on one hand furnished a complete explanation of the system of kinship in force among the American Indians, which had been the point of departure for all the studies of Morgan. On the other hand it formed a ready means for the deduction of the maternal law gens. And finally it represented a far higher stage of development than the Australian classes.
It is, therefore, easy to understand how Morgan could regard this form as the stage necessarily preceding the pairing family and attribute general extension in former times to it. Since then we have learned of several other forms of the group marriage, and we know that Morgan went too far in this respect. But it was nevertheless his good fortune to encounter in his Punaluan family the highest, the classical, form of group marriage, that form which gave the simplest clue for the transition to a higher stage.
The most essential contribution to our knowledge of the group marriage we owe to the English missionary, Lorimer Fison, who studied this form of the family for years on its classical ground, Australia. He found the lowest stage of development among the Papuans near Mount Gambier in South Australia. Here the whole tribe is divided into two great classes, Kroki and Kumite.16 Sexual intercourse within each of these classes is strictly prohibited. But every man of one class is by birth the husband of every woman of the other class, and vice versa. Not the individuals are married to one another, but the whole groups, class to class. And mark well, no caution is made anywhere on account of difference of age or special consanguinity, unless it is resulting from the division into two exogamous classes. A Kroki has for his wife every Kumite woman. And as his own daughter, being the daughter of a Kumite woman, is also