revert or to breed true, more or less closely, to one or another of certain types of human nature that have in their main features been fixed in approximate conformity to a situation in the past which differed from the situation of to-day. There are several of these relatively stable ethnic types of mankind comprised in the populations of the Western culture. These ethnic types survive in the race inheritance to-day, not as rigid and invariable moulds, each of a single precise and specific pattern, but in the form of a greater or smaller number of variants. Some variation of the ethnic types has resulted under the protracted selective process to which the several types and their hybrids have been subjected during the prehistoric and historic growth of culture.
This necessary variation of the types themselves, due to a selective process of considerable duration and of a consistent trend, has not been sufficiently noticed by the writers who have discussed ethnic survival. The argument is here concerned with two main divergent variants of human nature resulting from this, relatively late, selective adaptation of the ethnic types comprised in the Western culture; the point of interest being the probable effect of the situation of to-day in furthering variation along one or the other of these two divergent lines.
The ethnological position may be briefly summed up; and in order to avoid any but the most indispensable detail the schedule of types and variants and the scheme of reversion and survival in which they are concerned are here presented with a diagrammatic meagreness and
