From what we know of living anthropoids, we may infer that the chief mental activities of the group will be three in number—namely, those concerning with mating, maternity, and social behaviour. Each group will be attached to a territory and maintain its isolation.

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Quote text and notes from Wikiquote: Arthur Keith (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.