The twelve totem groups are brought under four subclasses and two main classes. All the divisions are exogamous[15]. The subclass c forms an exogamous unit with e, and the subclass d with f. The success or the tendency of these arrangements is quite obvious; they serve as a further restriction on the marriage choice and on sexual freedom. If there were only these twelve totem groups—assuming the same number of people in each group—every member of a group would have 11/12 of all the women of the tribe to choose from. The existence of the two phratries reduces this number to 6/12 or ½; a man of the totem α can only marry a woman from the groups 1 to 6. With the introduction of the two subclassess the selection sinks to 3/12 or ¼; a man of the totem α must limit his marriage choice to a woman of the totems 4, 5, 6.
The historical relations of the marriage classes—of which there are found as many as eight in some tribes—are quite unexplained. We only see that these arrangements seek to attain the same object as the totem exogamy, and even strive for more. But whereas the totem exogamy makes the impression of a sacred statute which sprang into existence, no one knows how, and is therefore a custom, the complicated institutions of the marriage classes, with their sub-divisions and the conditions attached to them, seem to spring from legislation with a definite aim in view. They have perhaps taken up afresh the task of incest prohibition because the influence of the totem was on the wane. And while the totem system is, as we know, the basis of all other social obligations and moral restrictions of the tribe, the importance of the phratries generally ceases when the regulation of the marriage choice at which they aimed has been accomplished.
In the further development of the classification of the marriage system there seems to be a tendency to go beyond the prevention of natural and group incest, and to prohibit marriage between more distant group relations, in a manner similar to the Catholic church, which extended the marriage prohibitions always in force for brother and sisters, to cousins, and invented for them the grades of spiritual kinship[16].
It would hardly serve our purpose to go into the extraordinarily intricate and unsettled discussion concerning the origin and significance of the marriage classes, or to go more deeply into their relation to totemism. It is sufficient for our purposes to point out the great care expended by the Australians as well as by other savage people to prevent incest[17]. We must say that these savages are even more sensitive to incest than we, perhaps because they are more subject to temptations than we are, and hence require more extensive protection against it.
But the incest dread of these races does not content itself with the creation of the institutions described, which, in the main, seem to be directed against group incest. We must add a series of ‘customs’ which watch over the individual behaviour to near relatives in our sense, which are maintained with almost religious severity and of whose object there can hardly be any doubt. These customs or custom prohibitions may be called ‘avoidances’. They spread far beyond the Australian totem races. But here again I must ask the reader to be content with a fragmentary excerpt from the abundant material.
Such restrictive prohibitions are directed in Melanesia against the relations of boys with their mothers and sisters. Thus, for instance, on Lepers Island, one of the New Hebrides, the boy leaves his maternal home at a fixed age and moves to the ‘clubhouse’, where he there regularly sleeps and takes his meals. He may still visit his home to ask for food; but if his sister is at home he must go away before he has eaten; if no sister is about he may sit down to eat near the door. If brother and sister meet by chance in the open, she must run away or turn aside and conceal herself. If the boy recognizes certain footprints in the sand as his sister’s he is not to follow them, nor is she to follow his. He will not even mention her name and will guard against using any current word if it forms part of her name. This avoidance, which begins with the ceremony of puberty, is strictly observed for life. The reserve between mother and son increases with age and generally is more obligatory on the mother’s side. If she brings him something to eat she does not give it to him herself but puts it down before him, nor does she address him in the familiar manner of mother and son, but uses the formal address. Similar customs obtain in New Caledonia. If brother and sister meet, she flees into the bush and he passes by without turning his head toward her[18].
On the Gazella Peninsula in New Britain a sister, beginning with her marriage, may no longer speak with her brother, nor does she utter his name but designates him by means of a circumlocution[19].
In New Mecklenburg some cousins are subject to such restrictions, which also apply to brothers and sisters. They may neither approach each other, shake hands, nor give each other presents, though they may talk to each other at a distance of several paces. The penalty for incest with a sister is death through hanging[20].
These rules of avoidance are especially severe in the Fiji Islands where they concern not only consanguineous sisters but group sisters as well.