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Rh otherwise uses for his own children, and, conversely, a person applies to his father's sister's son a term he otherwise uses for his father. Thus, in the following diagram, C will apply to D and e the terms which are in general use for a son and daughter, while D and e will apply to C the term they otherwise use for their father.

In most forms of the classificatory system members of different generations are denoted in wholly different ways and belong to different classes, but here we have a case in which persons of the same generation as the speaker are classed with those of an older or a younger generation.

I will first ask you to consider to what kind of psychological similarity such a practice can be due. What kind of psychological similarity can there be between one special kind of cousin and the father, and between another special kind of cousin and a son or daughter? If the puzzle as put in this form does not seem capable of a satisfactory answer, let us turn to see if the Banks Islanders practise any social custom to which this peculiar terminology can have been due. In the story of