It may be argued that as a matter of fact humanity has until recently been segregated in pools; that in the great civilization of China, for example, humanity has pursued its own interlacing system of inheritances without admixture from other streams of blood. But such considerations only defer the conclusion; they do not stave it off indefinitely. It needs only that one philoprogenitive Chinaman should have wandered into those regions that are now Russia, about the time of Pericles, to link east and west in that matter; one Tartar chieftain in the Steppes may have given a daughter to a Roman soldier and sent his grandsons east and west to interlace the branches of every family tree in the world. If any race stands apart it is such an isolated group as that of the now extinct Tasmanian primitives or the Australian black. But even here, in the remote dawn of navigation, may have come some shipwrecked Malays, or some half-breed woman kidnapped by wandering Phoenicians have carried this link of blood back to the western world. The more one lets one’s imagination play upon the incalculable drift and soak of population, the more one realizes the true value of that spreading relation with the past. But now let us turn in the other direction, the direction of the future, because there it is that this series of considerations becomes most edifying. It is the commonest trick to think of a man’s descendants as though they were his own. We are told that one of the dearest human motives is the desire to found a family, but think how much of a family one founds at the best. One’s son is after all only half one’s blood, one grandson only a quarter, and so one goes on until it may be that in ten brief generations one’s heir and namesake has but 1/1024th of one’s inherited self. Those other thousand odd unpredictable people thrust in and mingle with one’s pride. The trend of all things nowadays--the ever-increasing ease of communication, the great and increasing drift of population, the establishment of a common standard of civilization--is to render such admixture far more probable and facile in the future than in the past.