The present tendency of this selective process is not simply a reversion to a given, immutable ethnic type.

It tends rather to a modification of human nature differing in some respects from any of the types or variants transmitted out of the past.

The objective point of the evolution is not a single one.

The temperament which the evolution acts to establish as normal differs from any one of the archaic variants of human nature in its greater stability of aim--greater singleness of purpose and greater persistence in effort.

So far as concerns economic theory, the objective point of the selective process is on the whole single to this extent; although there are minor tendencies of considerable importance diverging from this line of development.