As the chief characteristic of Positive Philosophy is the paramount importance that is given, and that on speculative grounds, to social considerations, its efficiency for the purposes of practical life is involved in the very spirit of the system. When this spirit is rightly understood, we find that it leads at once to an object far higher than that of satisfying our scientific curiosity; the object, namely, of organizing human life. Conversely, this practical aspect of Positive Philosophy exercises the most salutary influence upon its speculative character. By keeping constantly before us the necessity of concentrating all scientific efforts upon the social object which constitutes their value, we take the best possible means of checking the tendency inherent in all abstract enquiries to degenerate into useless digressions. But this general connection between theory and practice would not by itself be sufficient for our purpose. It would be impossible to secure the acceptance of a mental discipline, so new and so difficult, were it not for considerations derived from the general conditions of modern society; considerations calculated to impress philosophers with a more definite sense of obligation to do their utmost towards satisfying the wants of the time. By thus arousing public sympathies and showing that the success of Positivism is a matter of permanent and general importance, the coherence of the system as well as the elevation of its aims will be placed beyond dispute.