In a recent discussion of physical and social kinship, Barnes (1961: 297 and 1964) has suggested that the traditional anthropological distinction between the pater and the genitor of a child is inadequate for analytic purposes. The pater is the social father --or he who raises the child, whereas the notion genitor usually refers to the 'physical father' or 'he who begot the child'; similarly, the mater is the social mother, whereas the genitrex is the 'physical mother.' Barnes makes an additional distinction; namely, between the genetic father and the culturally defined genetic father-the genitor-and the genetic mother and the culturally defined genetic mother-the genitrex. There are, then, in each case, three terms: (a) the genetic mother, genitrex, and the mater, on the one hand, and (b) the genetic father, genitor, and the pater, on the other. This is an important distinction. In this note, I would like to discuss some of these conceptions in reference to (a) some ethnographic data on household organization and sexual behavior that I collected several years ago in the Caribbean, and (b) to some general properties of AmericanEnglish kinship terminology. These examples will, in turn, be related-on a relatively primitive level-to the more general problem of the significance of physical facts, of one sort or another, in social anthropology. Let us begin by considering some of the possible relations between the terms listed above. The relationship between the genetic (or physical) mother and the genitrex, Barnes (1961:298) points out, is usually one of identity: gestation is a biological fact that is difficult to conceal, although there are both literary and political examples of simulated maternity (Gellner 1963:242). In general, two categories, the genetic mother and the culturally defined genetic motherthe genitrex-are mutually inclusive; the social category is concordant with the 'physical reality' to which it refers. The relationship between the genitrex and the mater need not be one of identity; but the disparity between these terms is systematic and invariably known, or, at least, discoverable. The terms mater and genetrex may refer to mutually exclusive cate-
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