Whichever theory we adopt to give a rational explanation of human existence, that theory must take into account and explain the mental nature we see at work in all modern communities.
Arthur Keith
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Tribal life comes automatically to an end when a primitive people begins to live in a town or a city, for sooner or later a tribal organization is found to be incompatible with life in a city.
- Arthur Keith -
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Before the discovery of agriculture mankind was everywhere so divided, the size of each group being determined by the natural fertility of its locality.
- Arthur Keith