Instead of appealing, like Plato, to the individual consciousness, and trying to discover ultimate truth by bringing its data into harmony among themselves, Aristotle appeals to the historic consciousness, and endeavors to find truth by harmonizing and complementing its data through a further appeal to the outer world, in which these data are realized. He maintains that the truths reached by the dialectic process are merely formal, and therefore empty,--useless in practice, until they have been filled by experience from the storehouse of nature. In consequence of this changed attitude, he sets aside the dialectic process, and substitutes for it the _Method of Induction_, which he was the first man in the world to comprehend, expound, and apply, becoming thus the father of all true science. And he makes a more extensive use of induction than any other man since his time, applying it in a field in which even now it is hardly supposed to yield any results, the field of the common consciousness. Indeed, he everywhere begins his search for concrete truth by examining the historic consciousness, and, having, by a process of induction, discovered and generalized its contents, he turns with these to nature and, by a second induction, corrects, completes, and harmonizes them. We might express this in modern language, by saying that his whole endeavor is to correct and supplement the imperfect human consciousness by a continual appeal to the divine consciousness, _as manifested in the world_. It is the error of modern investigators that they employ only one-half of the inductive method, the objective, and either omit altogether the subjective, or else, like Plato, apply it only to the individual consciousness. Hence come the widely divergent results which still meet us in so many of the sciences, in Politics, Psychology, etc., hence the fact that a great deal of science, instead of correcting, widening, and harmonizing the common consciousness, stands altogether apart from it, or even in direct opposition to it. The man who writes a treatise on Psychology, or on the Soul, without troubling himself to discover what "Soul" means in the general consciousness of mankind, and perhaps setting out with an altogether individual notion of it, can hardly look for any other result. Aristotle, true to his method of induction, devotes one entire book of his _Psychology_ to finding out what "Soul" means in the historic consciousness, unreflective as well as reflective. Then, with this meaning, he goes to nature, seeks by induction to discover what she has to say about it, and abides by her reply. Hence it is that his thought has laid hold upon the world, and influenced it in practical ways, as no other man's thought has ever done. Hence it is that, of all ancient men, he is the one before whom the modern scientist bows with respect.