A superficial view of the group we have examined might, from its general resemblance in custom to others among actual lower types of man, lead to a hasty conception of perfect identity, from a social point of view, in nearly all other respects. We see that exogamy, hostile capture, group marriage,[1] and obedience to certain accepted rules of avoidance, are common to both, to the hypothetical semi-bestial and to the actual savage groups.
The impression, however, would be very erroneous.
In the former, the hypothetical archaic stage, still lurked as a festering canker, an archaic element in marital prerogative, which marks it as of an epoch in the life-history of our race when the brute still triumphed over the man, an epoch far removed from our own. It possessed a feature in connubial relations as between certain group members which placed a profound gulf between it and any existing form of these days—a trait which, whilst it endured, would tend to render all further social progress difficult, if not impossible. It barred the road to that next great gradation in sociological evolution which is implied in the friendly conjunction of groups in a tribe. The latter stage was a vast upward step, but still it was only one round in the ladder of ascent to man, and indeed derived its chief importance from this fact as such. The tribe was the real goal; there, only, could be found the vital quality of social stability to be conferred by peaceful connubium between united groups as opposed to hostile capture between isolated families. Each group must come to be in itself complete, and yet each must form the necessary complementary parts of the actual Tribe common to all lower races, with its typical divisional inter-marriageable group classes ['phratries']. The fatal bar to a higher platform was a heritage from the anthropoid ancestor, and, as such, eminently characteristic of an animal stage.
This odious inheritance was the habit of incest between father and daughter, which we have found to be common to all the mammalia as a dominant domestic feature. As a factor in evolution we have seen that it actually had as direct outcome the primal law itself, and thus, with a strange irony, it may be said to have so laid the foundation of an ultimate moral sense. In such or other action in the past it had, however, served its useful purpose. Its operation in the future could be but detrimental; so opposed to all advance does it become, that, as we shall find, it is to be finally swept aside so completely as to permit to some students doubts of its existence, though 'In Saturn's time such mixture was not held a crime.' Leaving no traces of action in actual usage save in such exceptions as prove the rule, it will not be difficult to show that, in giving birth to the primal law, it doomed its own existence, and this apart from any ethical connection. The continued progress of society led almost mechanically to developments eminently inimical to its continuance as a custom, whilst again it would be found even injurious to the order of things as constituted in the earliest group-plus-tribe stage. If we bear in mind the axiom that, other things being equal, the largest assemblage of individuals in amity would have the greatest chance of survival, as possessing more numerous units of strength, then father-and-daughter marriage would be pernicious by preventing an assembly from profiting to a full extent by the productive powers of all its members. For such incest implies sole marital rights by a senior generation of males over a junior generation of females. As the latter would always, from mere disparity of age, outlive the former, it follows that, on the death of a father the daughters would remain unproductive, the only other males in the family group being their own brothers, and as such barred to them by the primal law.
This situation, in itself an element of weakness, became doubly so, if, as is probable, these young widowed females seceded to other and hostile groups with whom union to them was free. Such groups would in consequence be by so much strengthened, at the expense of their original circle. If, on the other hand, these widows remained in their own circle, their presence as useless mouths would be embarrassing, and a possible source of danger as a temptation to outside suitors. Again, celibacy being quite an anomaly in such an era, complications might arise from possible infractions of the primal law itself within a group.
But it is in special relation to the further movement in advance implied in the friendly aggregation of groups into a tribe that the effects of paternal incest would be most fatally felt. For while it reigned as a custom and a father usurped sole marital right over the whole feminine element, the immigration into the group of outside suitors for their hands would be impossible, their possession by the latter would be only possible after capture, which, being hostile, would tend to keep asunder the different groups. And yet in the next and higher stage of social evolution, as presented in the amalgamation of groups into a tribe, the acceptation of these outside mates in peaceful connubium is precisely the most characteristic feature. In later days they will be found as the male members of a certain 'class' in one 'phratry,' and, de facto, eligible in group marriage with all and certain females of the corresponding category as regards birth in another phratry, within an all-embracing tribe. As indeed with actual Australians, where, by right of birth alone each 'class' contains the natural born husbands of the wives of another 'class.' Such connubium is evidently impossible while incest flourished as a custom, it could only arise after its decay.[2]
It thus becomes necessary to study by what possible conjunction of affairs so desirable a result was arrived at. We will find that, however fortuitous the event of the primary inclusion of an outside possible suitor within a group, however timid and hesitating his entry, his presence there would be the signal of the beginning of the end. Now it is evidently hopeless to look for any voluntary acceptance of his claims by the living father, to whom the temptation to so easy a procuring of an inmate of his harem as his own daughter would be irresistible. There would be also on his side all habit and tradition, and with no direct group interest in opposition, the brothers being unconcerned. The initiative in change must then arise irrespective of him, and without the obstacle of his presence. This could only be possible thus after his death.
Now it is important to observe that precisely the embarrassment we have seen arise after this event must be a means to the end of the conjunction we seek. We have noted the danger of the situation under such circumstances; ineligible in union by the primal law with the remaining male element, which is composed of their own brothers, temptations to its infraction would be as frequent as fatal, on the part of the early widowed sisters. On the other hand, the anomaly of a celibate existence in the animal stage would tend to the secession of widows, so to speak, to hostile hordes, or to constant attempts at hostile capture by the outside suitor. But with the friendly entry of the latter and his acceptance as a group member, all these disturbing influences would at once cease; further, the value of an extra unit of strength in his presence would soon make itself felt.
Let us then imagine a band of brothers willing to aid in the sustenance of their widowed sisters, strong enough to defy their capture by others, and determined to frustrate any attempt at escape on their part. The inevitable result would be the attraction within their own circle of suitors for their hands. Now it is worthy of note that the feasibility of the process of such attraction and inclusion becomes more obvious when we reflect that if, as is probable, they belonged to a neighbouring group, they would thus by no means find themselves quite strangers in their new home. For it is precisely from near neighbours that their wives would have been captured by the males of the assembly they have now joined. These wives, in fact, would be probably own sisters to the immigrants. As such, then, we can understand an easier tolerance of their presence by the resident males, their new brothers-in-law; as brothers and sisters the primal law created such a bar in division between their own wives and the new comers, as put aside any possible chance of friction in jealousy.