If it be asked how possibly out of one law, and such a one, there could arise anything like that endless variety which nature displays, the answer is, that the law operates between two limits, poles, or points of assimilation, which are entirely dissimilar, and by two processes simultaneously, analysis and synthesis, which are the opposites of each other. Hence it comes to pass that actual nature is a web, in which unity and multiplicity, identity and difference, are everywhere interwoven, and in such harmony that nature is everywhere beautiful. It is not necessary here to repeat the illustrations by which Macvicar seeks to demonstrate that existence is force--self-manifesting, or spontaneously radiant, so to speak, into that which is idea, if there be a recipient of ideas, or a percipient of ideas; or, more generally, a percipient within the sphere of its action. He does not prescribe any limits, in space, as to the extent of this self-manifesting power. Thus, it is one of the most certain facts in physics that every atom of this planet, nay, every atom of the planet Neptune, whose distance from the sun is thirty times as great as our distance, manifests itself to every atom of this planet--not, indeed, as a percept, but as the subject and the object of attraction or motion. Nay, by the aid of the ether, which is the grand medium whereby the self-manifesting power of being is enabled to take effect at a distance when no other being is interposed, the fixed stars manifest themselves at our planet, though their distances be inconceivably great. Distant objects acting like all objects assimilatively, assimilate the intervening ether and the optic apparatus to themselves, and thus render themselves perceptible. This they do, indeed, only under great limitation, imposed by the laws of inertia or motion in space, to which the ether is subject--limitation which, in man, it requires self-teaching and experience to remove, so that he may perceive the object in its true forms and dimensions. But this is only man's peculiarity, in consequence of his organic defects at birth. The chick, the day it leaves the egg, can run up with equal precision to a crumb of bread, or to an ant's egg at a distance. And so with all species whose myo-neuro-cerebral system functions perfectly from their birth. At his best, the embodied mind in man sees objects only in perspective. But the nature of this self-manifesting power need not be dwelt upon, since it is only the existence of this power that is insisted upon. How far beyond the visible and tangible parts of the body, the spirit, as a power exerting some kind of action or other, extends, Macvicar thinks cannot be determined. No doubt, every force has a centre of action; but as to the full extent in space of a unit of natural force, as an agent of one kind or another, no limits can be assigned. Who shall tell us the boundary in the outward of that power which says "I will," "I feel," "I see"? Its