How explain, moreover, without this reality of science, the power that science gives to man over Nature? His power, is it not always exactly in proportion to his knowledge? In what then does this objectivity of science consist if it is not founded on the pretended knowledge of the thing in itself? In the necessary link that scientific thought establishes between phenomena. This necessity does not come from experience, for it is something ideal, which our mind adds to all experience. But, as we can only think according to these necessary laws, we necessarily objectivise in all scientific study. We thus affirm, of necessity, the fundamental unity of the laws of thought and the laws of phenomena. Experience always confirms this immediate affirmation. Now this necessity, it is objectivity itself; it is the only noumenon that we are authorised to seek behind phenomena in Nature, and behind the manifestations of pure reason in spirit. The first effect of this objective necessity is to eliminate from the work of science the feelings and the subjective will of the ego. A thinking and acting subject is no doubt necessary in making science; but the characteristic of science is to see what it studies apart from the subject, apart even from the psychical phenomena that it observes in the ego itself. Posited outside the ego, the laws that it promulgates appear to us therefore independent of it. This elimination of the subject from the conclusions of science thus becomes the sign and the measure of their objectivity. Where the elimination is complete, as in astronomy and physics, the objectivity is entire. On the contrary, history, _e.g._ where the elimination can never be absolute, always tends towards objectivity, but never reaches it.