A History of Matrimonial Institutions (Vol. 1-3). George Elliott Howard
Lubbock and Spencer, it will be observed, agree with McLennan in assigning the origin of exogamy to wife-capture. On the other hand, a group of writers, differing widely on ancillary questions, unite in identifying the causes which have produced exogamy with those which, in general, have led to the establishment of forbidden degrees of consanguinity in marriage. In other words, tribal or clan exogamy is but one of many rules for the prevention of close intermarriage between kindred. It must be admitted that a profound horror of incest is now "an almost universal characteristic of mankind, the cases which seem to indicate a perfect absence of this feeling being so exceedingly rare that they must be regarded merely as anomalous aberrations from a general rule."[366] But, from the beginning, has there been an innate aversion to the sexual union of persons closely related by blood? Is that aversion derived from experience of the injurious results of such unions? Did it originally extend only to marriage and not to irregular sexual connections? Or, finally, is it the indirect result of a custom, such as wife-capture, hardening into a rule of forbidden degrees? These are questions to which very different answers have been given.
Adherents of the horde theory, of course, deny that horror of incest is a primitive instinct. Such is the view also of Spencer, who thinks that "regular relations of the sexes are results of evolution, and that the sentiments upholding them have been gradually established,"[367] though—somewhat inconsistently, as we have seen—he agrees with McLennan in regarding exogamy as the result of custom growing into law. Lubbock takes a similar position, denying that we can "attribute to savages any such farsighted ideas" as the recognition of the injurious effects of close intermarriage.[368] On the other hand, Morgan, whose consanguine family implies the absence of any primitive abhorrence of incest, considers exogamy "explainable, and only explainable as a reformatory movement to break up the intermarriage of blood relations," thus implying that the aversion to such a union is derived from experience.[369] But knowledge which "can only be gained by lengthened observation," Dr. Peschel believes, "is 'unattainable by unsettled and childishly heedless races,' among whom, nevertheless, a horror of incest is developed most strongly."[370] Sir Henry Maine, on the contrary, "cannot see why the men who discovered the use of fire and selected the wild forms of certain animals for domestication and of vegetables for cultivation should not find out that children of unsound constitution were born of nearly related parents."[371] The researches of Starcke, and still more those of Westermarck, render it almost certain, however, that Morgan and Maine are mistaken in their view, though it may point the way to the truth.[372]
Starcke's argument leads up to the conclusion that the basis of exogamy is to be sought in the causes which produced the clan; for between the clans of a tribe exogamy almost always prevails, and, without exception, clanless tribes are "endogamous or at least not exogamous." Furthermore, tribes divided into clans are usually endogamous as to the tribe.[373] Now, prohibitions are found which cannot be due to "exogamy as a definition of the clan;" such is the prohibition of marriage between mother and son where agnation is in force, and "between father and daughter where the uterine line prevails." Since, therefore, "exogamy as a definition of the clan cannot directly produce these prohibitions, which are found wherever exogamy occurs, and in some instances where it is absent," the inference follows that exogamy must have its origin in the abhorrence of close intermarriage and the ideas to which that is due. But these ideas are not necessarily the same as those underlying "the various prohibited degrees of marriage which are now in force;" nor do they imply that the injuriousness of such unions is the ground of the aversion. "In a community in which marriage takes place between consumptive and syphilitic persons, and those affected by hereditary disease, without being condemned by public opinion, and still less by the law, it cannot be said that the condemnation of incest is founded on our regard for posterity."[374] In harmony with his view that marriage is juridical, not founded on sexual relations, he finds the origin of the horror of marriage between near kindred in the legal incongruity of such unions and in their danger to the peculiar constitution of the ancient family itself. Marriage between a brother and sister or between a mother and son would usually be impossible because the "son possesses nothing which he could offer to the father as purchase-money." To accomplish the purpose by force would be an "unheard-of crime among savages." A connection between a father and daughter would seldom occur, "since a father is unwilling to renounce the advantages of bestowing his daughter in marriage."[375] "If in this way an impression arises that there is something unusual and incompatible with other ideas in marriage between such persons, an occasional calamity which befalls any of them will be enough to excite the imaginative faculty in the highest degree; and if no prohibition previously existed, the absolute condemnation of such marriages would then be pronounced." In a word, "the intermarriage of individuals of the same family implies that persons who have no legal right to dispose of themselves and their property nevertheless agree upon such legal disposition, an encroachment which would certainly be violently opposed by primitive men." In the same way, exogamy will arise between clans; and the co-existence of endogamy and exogamy seems to be consistently explained by this theory. "Exogamy prohibits marriage between persons who are so nearly related that they have no legal independence of each other; endogamy prohibits the marriage of persons whose legal status is too remote from each other."[376] In corroboration of his view, Starcke finds evidence that, here and there, a distinction is made between regular marriage and sexual intercourse, the former being forbidden, unless for special reasons, while the latter is allowed.[377]
If Starcke's explanation of the origin of the dread of close intermarriage between kindred is too vague and ill supported by definite proof, his original suggestion that exogamy must take its rise in that horror is sustained and placed on a broader foundation by the singularly interesting researches of Westermarck[378]—a scholar who has rendered to social science a very important service by carrying the principles of organic evolution into the sphere of domestic institutions. He starts with the assertion that horror of incest is universal. Writers have, indeed, collected evidence which they believe points to a time when such an aversion did not exist. Thus marriage with a sister is permitted in Ceylon and Annam; in the royal families of Siam, Burma, and the Sandwich Islands; while the same custom prevailed, as is well known, among the Ptolemies of Egypt, and among the kings of ancient Persia.[379] But these unions are either "anomalous aberrations" from the general rule; or else they are allowed in order to preserve the purity of caste or the royal blood; or, in case of half-sisters, because relationship is traced in one line only;[380] while occasionally they may result from "extreme isolation" or from "vitiated instincts."[381] Everywhere prohibitions exist, though they vary greatly in the "degrees of kinship within which union is forbidden." As a rule, "among peoples unaffected by modern civilization the prohibited degrees are more numerous than in advanced communities, the prohibitions in a great many cases referring even to all the members of the tribe or clan."
For instance, to select a few examples from the wealth of illustration provided by Westermarck, the "Californian Gualala account it 'poison,' as they say, for a person to marry a cousin or an avuncular relation, and strictly observe in marriage the Mosaic table of prohibited affinities."[382] Among the "Bogos of Eastern Africa, persons related within the seventh degree may not intermarry, whether the relationship be on the paternal or maternal side;" and a similar rule exists among the Pipiles of San Salvador. "Among the Kalmucks, no man can marry a relation on the father's side; and so deeply rooted is this custom among them, that a Kalmuck proverb says, 'The great folk and dogs know no relationship,' alluding to the fact that only a prince may marry a relative." Often clan exogamy is enforced by the severest penalties. "The Algonquins tell of cases where men, for breaking this rule, have been put to death by their nearest kinsfolk."[383]
Westermarck next takes up the origin of prohibited degrees; and after a critical examination of the various theories to explain it, he comes to the conclusion that in no case observed is the prohibition of incest founded on conscious experience of its injurious effects. It has not come into existence as the result of observation or calculation or through education on the part of the savage. Law and custom might thus arise; and these may "prevent passion from passing into action, they cannot wholly destroy its inward power." The home is kept pure "neither by laws, nor by customs, nor by education, but by an instinct which under normal circumstances makes sexual love between the nearest kin a psychical impossibility." But this instinct is not an "innate aversion to marriage with near relations." It is rather an "innate aversion to sexual intercourse between