And so mankind, exalted in mind and with cheerful courage, enters upon the course which promises so much. 1. THE NATURALISTIC SYSTEM The movement towards giving sole attention to the world of sense cannot make sure progress without a more definite decision concerning the main agents and the main direction of work. Different possibilities here offer themselves; three, however, in particular. In reality, these have all evolved, sometimes blending together and strengthening one another, at other times crossing and hindering one another. None of these movements has displayed more energy and exercised more power than that which makes the sense experience of surrounding nature its basis, and strives to include man's entire being within this experience. This is Naturalism, which, starting out from the mechanical conception of nature, which has been developed in the Modern Age, applies the ideas thus obtained to everything, and subordinates even the life of the soul to them. The movement originated at the dawn of the seventeenth century, when an independence and autonomy of nature began to be acknowledged. Nature had been covered with a veil of explanation, mainly æsthetic or religious in character, which gave it a colour corresponding to the prevailing disposition, but at the same time excluded the possibility of a scientific comprehension. A comprehension of this kind could only be attained by getting rid of all subjective addition which had been made by man, and by investigating nature purely by itself. Since Descartes and Galileo that has been accomplished, and nature now appears as an immense web of single threads, as a complex of fundamentally mobile, but soulless, elements, whose movements take simple basal forms, while the combination of these elements produces all constructions, even the most complicated. This mighty machinery never points beyond, and as it runs its course solely within itself, so it requires to be understood solely from itself. Everything spiritual is thus eliminated; this realm of fact has no implication of aims, or of a meaning of events. This new scientific conception of nature had first, with much toil and difficulty, to wrestle with the traditional, naïvely human, representation; this was chiefly a matter of reducing first appearances to their simple elements, and of constructing the world anew from these. By this process, nature at the same time became accessible to the operation of man. For, the technical control of nature presupposes the analytic character of research; only such a research, with its discovery of the single elements and tendencies, places man in a relation of activity towards nature; while in earlier times only an attitude of contemplation had been granted to him. Natural Science thus created a new type of life, a life energetic, masculine, pressing forward unceasingly.