III. The World as Illusion

The results of modern natural science are two sharply marked opposites. One of them is the current of monism. It gives the impression of penetrating directly from natural science to the most significant problems of world conception. The other declares itself incapable of proceeding any further with the means of natural science than to the insight that to a certain subjective state there is a certain corresponding process of motion. The representatives of the two currents vehemently oppose each other. Du Bois-Reymond rejected Haeckel's History of Creation as fiction (compare Du Bois-Reymond's speech, Darwin versus Galiani). The ancestral trees that Haeckel constructs on the basis of comparative anatomy, ontogeny and paleontology appear to Du Bois-Reymond to be of “approximately the same value as are the ancestral trees of the Homeric heroes in the eyes of historical criticism.” Haeckel, on the other hand, considers the view of Du Bois-Reymond to be an unscientific dilettantism that must naturally give support to the reactionary world conceptions. The jubilation of the spiritualists over Du Bois-Reymond's “Limitation Speech” was so much the more resonant and justified, as Du Bois-Reymond had, up to that time, been considered an important representative of the principle of scientific materialism.