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Rh possible to infer with certainty the ancient existence of forms of marriage from the survival of their results in the terminology of relationship. In other cases, differences of culture or the absence of intermediate links make it unjustifiable to infer the ancient existence of the forms of marriage from which features of terminology might be derived. Other cases lie between the two, the confidence with which a form of marriage can be inferred varying with the degree of likeness of culture, the distance in space, and the presence or absence of other features of culture which may be related to the form of marriage in question. Even in the cases, however, where the inference is most doubtful, we have no right dogmatically to deny the origin of the terminology of relationship in social conditions, but should keep each example before an open mind, to guide and stimulate inquiry in a region where ethnologists have till now only scratched the surface covering a rich mine of knowledge.