The extension of evolution from this limited and lowly scope in the region of life into a theory of cosmical reach, and, still farther, into a theory of the origin of life, and then of the origin of mind, is an act for which science furnishes no warrant whatever. The step into boundlessness is simply the work of philosophical speculation, as it always is. I do not mean to say that philosophical speculation is necessarily without warrant, or destitute of evidences of its own, more or less valid within its own field. But what I do wish to say is, that these evidences are not the evidences of science; that scientific evidences must by their nature stop short of such sweeping universals; and that when either scientific men or the general public assume that such speculative extensions of principles reached in some narrow field of science have the support and the prestige of science, they are deluded by a sophism — a sophism really so glaring that its common prevalence is matter for astonishment, and might beforehand well be incredible. The correctness of this statement will appear as we go on.
No, our question is not in the least a question of science. It is only when men of science, or other
