This is almost certainly to overrate the effects of environment.

At the same time, in the present state of our knowledge, it would be premature either to affirm or deny that in the very long run round-headedness goes with a mountain life.
The grassland next claims our attention.

Here is the paradise of the horse, and consequently of the horse-breaker.

Hence, therefore, came the charging multitudes of Asiatic marauders who, after many repulses, broke through the Mediterranean cordon, and established themselves as the modern Turks; whilst at the other end of their beat they poured into China, which no great wall could avail to save, and established the Manchu domination.

Given the steppe-country and a horse-taming people, we might seek, with the anthropo-geographers of the bolder sort, to deduce the whole way of life, the nomadism, the ample food, including the milk-diet infants need and find so hard to obtain farther south, the communal system, the patriarchal type of authority, the caravan-system that can set the whole horde moving along like a swarm of locusts, and so on.