What unnecessary worry, then, for the representatives of mathematics, geology, palæontology, and chemistry to write burning protests against the fetters of dogma in the interest of their scientific activity! And it is superfluous worry for professors of the technical arts to get excited by imagining that electricity and steam must be treated according to ecclesiastical precepts. Nor is there need of emphasizing the statement that there cannot be a Catholic chemistry, geography, or mathematics—it is self-evident. Hence almost the entire province of the profane sciences, which are the pride of our age and occupy the foremost position in our universities, with their laboratories, institutes and observatories and meteorological stations, are free and perfectly undisturbed by faith. If accordingly any one should be of the opinion that the Christian-minded scientist were hindered in his scientific research, he would have to consider him an unhampered investigator at least in this vast field. Most in touch with faith comes _philosophy_. Not in the vast field of logic, of empirical psychology, in questions concerning the essence of bodies and their forces, in matters of mere history of philosophy; but in questions of views of the world and life, in metaphysics and ethics, it does. These, the highest questions, bearing on the direction and pursuit of human life, matters that most occupy the human mind, are at the same time subjects of revelation; God Himself has deigned to teach the truth in these matters, to make them safe for all time against the error of the mind of man. Here philosophers encounter danger-signals. They hear, what their reason even tells them, that it is erroneous to think there is no world of spirits, no God above nature, no immortality, no life hereafter, no providence. Nor could one say that philosophy is the loser by being kept from error which endangers human life. Nowhere are errors so apt to occur as in questions which are outside the sphere of immediate experience; nowhere are self-deceptions more common than there, where disposition and character continually influence the mind. A modern representative of philosophy, _E. Adickes_, writes as follows: “In the course of this history (of metaphysics) there have been given long since all the principal answers that are at all possible to all metaphysical questions. The building up of metaphysical systems can and will proceed, nevertheless, and their multiplicity will remain.... Of course, progress will not be gained thereby: results will not gain in certainty, contradictions and mysteries do not diminish.”