To what effect Lucretius and his like in classical antiquity, _e. g._, may have speculated and tried to speak in these premises is by no means easy to make out; nor does it concern the present inquiry, since no vital connection or continuity of habit is traceable between their achievements in this respect and the theoretical preconceptions of modern science or of the machine technology. In the course of modern times conceptions of an evolutionary sequence of creation or of genesis come up with increasing frequency, and from an early period in the machine age these conceptions take on more and more of a mechanistic character, but it is not until Darwin that such a genetic process of evolution is conceived in terms of blind mechanical forces alone, without the help of imputed teleological bias or personalised initiative. It may perhaps be an open question whether the Darwinian conception of evolution is in no degree contaminated with teleological fancies, but however that may be it remains true that a purely mechanistic conception of a genetic process in nature had found no lodgment in scientific theory up to the middle of the nineteenth century. With varying success this conception has since been assimilated by the adepts of all the material sciences, and it may even be said to stand as a tacitly postulated commonplace underlying all modern scientific theory, whether in the material or the social sciences. It is accepted by common consent as a matter of course, although doubtless much antique detail at variance with it stands over both in the theoretical formulations of the adepts and in popular thought, and must continue to stand over until the course of habituation may conceivably in time enforce the sole competency of this mechanistic conception as the definitive norm of systematic knowledge. Whether such an eventuality is to overtake the scope and method of knowledge in Western civilisation should apparently be a question of how protracted, consistent, unmitigated, and how far congruous with their native bent the discipline of the machine process may prove in the further history of these peoples. * * * * *