Kindred, as well as parents; teachers, as well as lords, were to be revenged. A considerable proportion of popular romance and drama is devoted to the subject of vengeance taken by women; and, as a matter of fact, women, and even children, sometimes became avengers when there were no men of a wronged family left to perform the duty. Apprentices avenged their masters; and even sworn friends were bound to avenge each other. [294] Why the duty of vengeance was not confined to the circle of natural kinship is explicable, of course, by the peculiar organization of society. We have seen that the patriarchal family was a religious corporation; and that the family-bond was not the bond of natural affection, but the bond of the cult. We have also seen that the relation of the household to the community, and of the community to the clan, and of the clan to the tribe, was equally a religious relation. As a necessary consequence, the earlier customs of vengeance were regulated by the bond of the family, communal, or tribal cult, as well as by the bond of blood; and with the introduction of Chinese ethics, and the development of militant conditions, the idea of revenge as duty took a wider range. The son or the brother by adoption was in respect of obligation the same as the son or brother by blood; and the teacher stood to his pupil in the relation of father to child. To strike one's natural parent was a crime punishable by death: to strike one's teacher was, before the law, an equal offence. This notion of the teacher's claim to filial reverence was of Chinese importation: an extension of the duty of filial piety to "the father of the mind." There were other such extensions; and the origin of all, Chinese or Japanese, may be traced alike to ancestor-worship. Now, what has never been properly insisted upon, in any of the books treating of ancient [295] Japanese customs, is the originally religious significance of the kataki-uchi. That a religious origin can be found for all customs of vendetta established in early societies is, of course, well known; but a peculiar interest attaches to the Japanese vendetta in view of the fact that it conserved its religious character unchanged down to the present era. The kataki-uchi was essentially an act of propitiation, as is proved by the rite with which it terminated,--the placing of the enemy's head upon the tomb of the person avenged, as an offering of atonement. And one of the most impressive features of this rite, as formerly practised, was the delivery of an address to the ghost of the person avenged. Sometimes the address was only spoken; sometimes it was also written, and the manuscript left upon the tomb.