That is to say, the human nature inherited by modern Occidental man is not nearly uniform in respect of the range or the relative strength of the various aptitudes and propensities which go to make it up.

The man of the hereditary present is slightly archaic as judged for the purposes of the latest exigencies of associated life.

And the type to which the modern man chiefly tends to revert under the law of variation is a somewhat more archaic human nature.

On the other hand, to judge by the reversional traits which show themselves in individuals that vary from the prevailing predatory style of temperament, the ante-predatory variant seems to have a greater stability and greater symmetry in the distribution or relative force of its temperamental elements.
This divergence of inherited human nature, as between an earlier and a later variant of the ethnic type to which the individual tends to breed true, is traversed and obscured by a similar divergence between the two or three main ethnic types that go to make up the Occidental populations.

The individuals in these communities are conceived to be, in virtually every instance, hybrids of the prevailing ethnic elements combined in the most varied proportions; with the result that they tend to take back to one or the other of the component ethnic types.