The most obvious example of this truth is furnished by that race which has been, and still is, the standard-bearer of human progress: I mean the Aryan race. As soon as Fate brings them face to face with special circumstances their powers begin to develop progressively and to be manifested in tangible form. The characteristic cultures which they create under such circumstances are almost always conditioned by the soil, the climate and the people they subjugate. The last factor--that of the character of the people--is the most decisive one. The more primitive the technical conditions under which the civilizing activity takes place, the more necessary is the existence of manual labour which can be organized and employed so as to take the place of mechanical power. Had it not been possible for them to employ members of the