Fison and Howitt[234] give other examples of marriage by exchange, and I have already given a description of the custom of Tualcha mura, the regular method of obtaining a wife among the central Australians, by means of which a man secures a wife for his son by making an arrangement with some other man with regard to the latter's daughter.
From the evidence given first of all I think we must conclude that early man was inclined to appropriate whatever women came in his way. In this regard we have a condition resembling that among the higher animals, where the more vigorous males try to monopolize the females. We may assume also that the women first appropriated were those born in the group—that is, in the immediate family—as being more proximate and not already possessed by others. In this regard also the condition resembled that among the higher gregarious animals; and in so far as the control of the women by the men of the group is concerned the condition remains unchanged. But the men have ceased to marry the women of their immediate families, and the problem of exogamy is to determine why men living with women and controlling them should cease to marry them.
In other papers I have pointed out that the interest of man is not held nor the emotions aroused when the objects of attention have grown so familiar in consciousness that the problematical and elusive elements disappear;[235] and I have also alluded to the laws of sexual life, that an excited condition of the nervous system is a necessary preparation to pairing.[236] And just here we must recognize the fact that monogamy is a habit acquired by the race, not because it has answered more completely to the organic interest of the individual, but because it has more completely served social needs, particularly by assuring to the woman and her children the undivided interest and providence of the man. But in early times the law of natural selection, not the law of choice, operated to preserve the groups in which a monogamous or quasi-monogamous tendency showed itself (since the children in these cases were better trained and nourished), and in historical times and among ourselves all of the machinery of church and state has been set in motion in favor of the system. In point of fact, the members of civilized societies at the present time have become so refined and have so far accepted ethical standards that monogamy is the system actually favored on sentimental grounds as well as on grounds of expediency by a large proportion of any civilized population. On the other hand, speaking from the biological standpoint, monogamy does not, as a rule, answer to the conditions of highest stimulation, since here the problematical and elusive elements disappear to some extent, and the object of attention has grown so familiar in consciousnes that the emotional reactions are qualified. This is the fundamental explanation of the fact that married men and women frequently become interested in others than their partners in matrimony. I may also just allude to the fact that the large body of the literature of intrigue, represented by the tales of Boccaccio and Margaret of Navarre, is based on the interest in unfamiliar women.
Familiarity with women within the group and unfamiliarity with women without the group is the explanation of exogamy on the side of interest; and the system of exogamy is a result of exchanging familiar women for others. We have seen that capture was not an important means of securing wives outside the group, and that exogamy was fully developed before property and media of exchange were developed to any extent, and consequently before the purchase of women had become a system. We have seen also that the Australian who wants a woman at the present time gets her by exchanging another woman for her. Social groups were necessarily small in the beginning. Before invention and co-operation have advanced far, the group must remain small in order to pick up enough food to sustain life on a given area.
Starting out with a single pair, when the family increases in size a separation is necessary; and clans are an outcome of the process of division and redivision, the bond between the clans and their union in a tribe resulting from their consciousness of kinship. Now, it is a well-known condition of exogamy that, while a man must marry without his clan, he must not marry without his tribe, and for the most part, in fact, the clan into which he shall marry is designated. In other words, allied clans gave their women in exchange mutually. This was a natural arrangement, both because the two groups were neighbors and because they were friendly, and at the same time the psychological demand for newness was satisfied. When a family was divided into two branches, Branch A had a property interest in its own women, but preferred the women of Branch B because of their unfamiliarity. The exchange took place at first occasionally and not systematically, and the women parted with in each case were not, perhaps, in all cases the youngest, and we may assume that they had in all cases been married before they were given up. But gradually, and when the habit of exchange had been established, men came to look forward to the exchange and to desire to secure the girl at the earliest possible moment, until finally young women were exchanged at puberty, and virgins. When for any reason there is established in a group a tendency toward a practice, then the tendency is likely to become established as a habit, and regarded as right, binding, and inevitable: it is moral and its contrary is immoral. When we consider the binding nature of the food taboos, of the couvade, and of the regulation that a man shall not speak to or look at his mother-in-law or sister, we can understand how the habit of marrying out, introduced through the charm of unfamiliarity, becomes a binding habit.
I think, therefore, we have every reason to conclude that exogamy is one expression of the more restless and energetic habit of the male. It is psychologically true that only the unfamiliar and not-completely-controlled is interesting. This is the secret of the interest of modern scientific pursuit and of games. States of high emotional tension are due to the presentation of the unfamiliar—that is, the unanalyzed, the uncontrolled—to the attention. And although the intimate association and daily familiarity of family life produce affection, they are not favorable to the genesis of romantic love. Cognition is so complete that no place is left for emotional appreciation. Our common expressions "falling in love" and "love at sight" imply, in fact, unfamiliarity; and there can be no question that men and women would prefer at present to get mates away from home, even if there were no traditional prejudice against the marriage of near kin.
THE PSYCHOLOGY OF MODESTY AND CLOTHING
No altogether satisfactory theory of the origin of modesty has been advanced. The naïve assumption that men were ashamed because they were naked, and clothed themselves to hide their nakedness, is not tenable in face of the large mass of evidence that many of the natural races are naked, and not ashamed of their nakedness; and a much stronger case can be made out for the contrary view, that clothing was first worn as a mode of attraction, and modesty then attached to the act of removing the clothing; but this view in turn does not explain an equally large number of cases of modesty among races which wear no clothing at all. A third theory of modesty, the disgust theory, stated by Professor James[237] and developed somewhat by Havelock Ellis,[238] makes modesty the outgrowth of our disapproval of immodesty in others—"the application in the second instance to ourselves of judgments primarily passed upon our mates."[239] The sight of offensive behavior is no doubt a powerful deterrent from like behavior, but this seems to be a secondary manifestation in the case of modesty. The genesis of modesty is rather to be found in the activity in the midst of which it appears, and not in the inhibition of activity like the activity of others. It appears also that it has primarily no connection with clothing whatever.[240]
Professor Angell and Miss Thompson have made an investigation of the relation of circulation and respiration to attention, which advances considerably our knowledge of the nature of the emotions. They say: