The phenomena, then, exhibited in the various processes which have been passed in review—nutrition, growth, repair, reflex action, instinct, the evolution of the individual and of the species—will, I think, abundantly serve to convince him who carefully considers them, that a mechanical conception of nature is inadequate and untenable. For it cannot be denied that in all these various natural processes, performed by creatures devoid of self-conscious intellect, there is somehow and somewhere a latent rationality, by the imminent existence of which their various admirably calculated activities are alone explicable. We are compelled to admit that the merely animal and vegetable worlds which we regard as irrational, possess a certain rationality. This innate mysterious rationality blindly executes the most elaborately contrived actions in order to effect necessary or useful ends not consciously in view. We have here to consider the question, “How is this blind rationality, this practical but unconscious intelligence, explicable?” Edward Von Hartmann, the eloquent prophet of the unconscious intelligence of nature, teaches us that such intelligence is the attribute of the very animals and plants themselves. But can we limit the manifestations of intelligence and quasi-instinctive purpose to the organic world? By no means. The phenomena of crystallisation, the repair in due form of the broken angle of a crystal, the inherent tendencies of chemical substances to combine in definite proportions, and other laws of the inorganic world, speak to us of unconscious intelligence and volition latent in it also. A perception of this truth has led to the conception of the universal presence of true intelligence, as it were in a rudimentary form, throughout the whole material universe—the universal diffusion of what the late Professor Clifford called “mind-stuff” in every particle of matter.