Note 237 — Chapter IV · —The Movements Of Peoples In Their Geographical Significance

The slighter the inner differences in an ethnic stock, whether in culture, language or physical traits, the smaller was their center of distribution and the more rapid their dispersal. The small initial habitat restricts the chances of variation through isolation and contrasted geographic conditions, as does also the short duration of their subsequent separation. The amazing uniformity of the Eskimo type from Bering Strait to eastern Greenland can only thus be explained, even after making allowance for the monotony of their geographic conditions and remoteness from outside influences. The distribution of the Bantu dialects over so wide a region in Central Africa and with such slight divergences presupposes narrow limits both of space and time for their origin, and a short period since their dispersal.237