Striking evidence of the effect of an association of ideas that is perfectly analogous to the one underlying the taboo of the mother-in-law, is offered by a custom which is doubtless generally only local in scope and yet is found in the most diverse parts of the earth, thus showing plainly that it is autochthonous in character. I refer to the custom of so-called father-confinement or 'couvade.' This custom prevails in various places, occurring even in Europe, where it is practised by the Basques of the Pyrenées, a remarkable fragment of a pre-Indo-Germanic population of Europe. Due, probably, to the heavier tasks which these people impose upon women, it here occasionally occurs in an exaggerated form. Even after the mother has already begun to attend to her household duties, the father, lying in the bed to which he has voluntarily retired, receives the congratulations of the relatives. Custom also demands that he subject himself to certain ascetic restrictions, namely, that he avoid the eating of certain kinds of food. The custom of couvade is clearly the result of an ideational association between husband and wife--one that is absolutely analogous to that between the two mothers of the married couple. The child owes its existence to both father and mother. Both, therefore, must obey the regulations which surround birth, and thus they are also subject to the same taboo. Just as there is very commonly a taboo on the mother and her new-born child, so also, in the regions where couvade exists, is this transferred to the husband.
As is well known, the last vestiges of the taboo of the mother-in-law have not yet disappeared, though they survive only in humour, as do many other customs that were once seriously practised. In fact, there is no other form of relationship, whether by blood or by marriage, that is so subjected to the satire of daily life as well as to the witticisms and jokes of comic papers as is that of the unfortunate mother-in-law. Thus, the primitive taboo resting on the mother-in-law and also, even though in lesser degree, on the father-in-law, has registered itself in habits that are relatively well known. Graver results of the regulations of ancient custom are doubtless to be found in those prohibitions of union between relatives by marriage that still constitute essential elements of present-day laws. This, of course, does not mean that these prohibitions are unjustifiable or that they do not reflect natural feelings. They but exemplify the fact that every law presupposes a development which, as a rule, goes back to a distant past, and that the feelings which we to-day regard as natural and original had a definite origin and assumed their present character as the outcome of many changes.