Overwhelming as may appear this unanimity between strong minds commanding respect and weak graphomaniacs, it does not, nevertheless, contain the slightest spark of truth. To assert that the world turns away from science because the ‘empirical,’ which means the scientific, method of observation and registration has suffered shipwreck, is either a conscious lie or shows lack of mental responsibility. A healthy-minded and honourable man must almost feel ashamed to have still to demonstrate this. In the last ten years, by means of spectrum-analysis, science has made disclosures in the constitution of the most distant heavenly bodies, their component matter, their degree of heat, the speed and direction of their motions; it has firmly established the essential unity of all modes of force, and has made highly probable the unity of all matter; it is on the track of the formation and development of chemical elements, and it has learnt to understand the building up of extremely intricate organic combinations; it shows us the relations of atoms in molecules, and the position of molecules in space; it has thrown wonderful light on the conditions of the action of electricity, and placed this force at the service of mankind; it has renewed geology and palæontology, and disentangled the concatenation of animal and vegetable forms of life; it has newly created biology and embryology, and has explained in a surprising manner, through the discovery and investigation of germs, some of the most disquieting mysteries of perpetual metamorphosis, illness, and death; it has found or perfected methods which, like chronography, instantaneous photography, etc., permit of the analysis and registration of the most fleeting phenomena, not immediately apprehensible by human sense, and which promise to become extremely fruitful for the knowledge of nature. And in the face of such splendid, such overwhelmingly grand results, the enumeration of which could easily be doubled and trebled, does anyone dare to speak of the shipwreck of science, and of the incapacity of the empirical method? Science is said not to have kept what she promised. When has she ever promised anything else than honest and attentive observation of phenomena and, if possible, establishment of the conditions under which they occur? And has she not kept this promise? Does she not keep it perpetually? If anyone has expected of her that she would explain from one day to another the whole mechanism of the universe, like a juggler explains his apparent magic, he has indeed no idea of the true mission of science. She denies herself all leaps and flights. She advances step by step. She builds slowly and patiently a firm bridge out into the Unknown, and can throw no new arch over the abyss before she has sunk deep the foundations of a new pier in the depths, and raised it to the right height.