Reason, or the faculty of thought, is therefore not a mystical object which produces the individual thought. On the contrary, it is a fact that certain individual thoughts are the product of perception gained in contact with certain objects and that these in connection with a certain brain operation produce the concept of reason. Reason as well as all other things of which we become aware has a two-fold existence: one as a phenomenon or sense-perception, the other as a concept. The concept of any thing presupposes a certain sense-perception of that thing, and so does the concept of reason. Since all men think as a matter of fact, every one has himself perceived reason as a part of reality, as a phenomenon, sense-perception or fact. Our object, reason, by virtue of the fact that it partakes of the nature of the senses, has the faculty of transforming the speculative method, which tries to dip understanding out of the depths of the spirit without the help of sense-perception, into the inductive method, and vice versa of transforming the inductive method, which desires to arrive at conclusions, concepts, or understanding exclusively by means of sense-perception, into the speculative method, by virtue of its simultaneous spiritual nature. Our problem is to analyze the concept of thought, or of the faculty of thought, or of reason, of knowing, of science, by means of thought. To produce thoughts and to analyze them is the same thing inasmuch as both actions are functions of the brain. Both have the same nature. But they are different to the same extent that instinct differs from consciousness. Man does not think originally because he wants to, but because he must. Ideas are produced instinctively, involuntarily. In order to become fully aware of them, to place them within the grasp of knowing and willing, we must analyze them. From the experience of walking, for instance, we derive the idea of walking. To analyze this idea means to solve the question, what is walking generally considered, what is the general nature of walking? We may answer: Walking is a rythmical motion from one place to another, and thus we raise the instinctive idea to the position of a conscious analyzed idea. An object is not consciously, theoretically, understood, until it has been analyzed. In examining what elements constitute the concept of walking, we find that the general attribute of that experience which we agree in calling "walking" is a rythmical motion. In actual experience steps may be long or short, may be taken by two feet or by more, in brief may be varied. But as a concept walking is simply a rythmical motion, and the analysis of this concept furnishes us with the conscious understanding of this fact. The concept of light existed long before science analyzed it, before it was understood that undulations of the ether form the elements which constitute the concept of light. Instinctive and analytical ideas differ in the same way in which the thoughts of every