both are essential to every true science, and physics, which stops with physics, leads man by dazzling promises into some Utopian desert only to leave him there to die of hunger. And it is no less true that metaphysics, without this basis in experimental science, is illusory and untrustworthy, wherever the original data are necessarily empirical. Two conditions are thus necessary to all science: a body of knowable truth capable of being systematized; and an intelligence capable of apprehending and systematizing it. One of these conditions is physical and one is metaphysical; and all true science must be the resultant of Law and Idea, the Objective and the Subjective, the twin forces of Nature and Man. If either of these conditions be wanting, there can be no true science, for science can neither be "evolved from the depths of the personal consciousness," nor can the scattered letters of scientific truth, as given in nature, arrange themselves into the words of a significant message. Knowledge must be classified before it is science, and that which classifies can only be intellect--discovering and enunciating this classification according to the laws of mental action. As prominence is given to one or other of these two conditions we have the division into Logical and Natural, but the fundamental principle of classification is the same in both--it being simply the law of intellectual action--just as the law which governs the action of the levers of a loom will determine the pattern of the woven fabric. There can, therefore, be no conflict between the methods of Logic and those of Nature. The determining element in all classification, whether of the phenomena of Mind or of the grosser phenomena of Matter is uniformly and always the same--the law of intellectual action. Science then resolves itself into a determination of this Law of mental activity, so that in an ultimate analysis, all science is metaphysical, just as all science primarily is physical. Here, as elsewhere, Law can be studied only in its objective manifestations. The Law of Thinking can be educed only from expressed Thought, but the Law is not objective thought, any more than the idea of the sculptor is marble, or the conception of the painter is paint. The simplest expression of thought is not the syllogism but the logical proposition. Now, it is plain that if the proposition is the formulation--the material representative of thought--if we study it as we study other natural symbols, we will find in it the fundamental Law of Thinking, and ultimately the fundamental Law of all Science: just as, if it were possible to reduce all elementary substances to one, the chemist would be able to find in that one a condensed expression of chemical science.