I. Haeckel and His Opponents

But who asked Du Bois-Reymond first to expel mind from matter, in order then to be able to observe that mind is not in matter? The simple attraction and repulsion of the tiniest particle of matter is force, therefore a spiritual cause proceeding from the substance. From the simplest forces we see the complicated human mind building itself up in a series of developments; and we understand it from this its becoming. “The problem of the origin and nature of consciousness is only a special case of the general problem in chief: that of the connection of matter and force” (Haeckel, Freie Wissenschaft and freie Lehre, p. 80). As a matter of fact, the problem is not at all, How does mind arise out of mindless matter? but, How does the more complex mind develop itself out of the simplest mental (or spiritual) actions of matter—out of attraction and repulsion? In the preface which Du Bois-Reymond has written to the reprint of his “Ignorabimus” speech, he recommends to those who are not contented with his declaration of the unknowableness of the ultimate grounds of being, that they should try to get along with the faith-conceptions of the supernatural view of the world. “Let them, then, make a trial of the only other way of escape, that of supernaturalism. Only that where supernaturalism begins, science ceases.” But such a confession as that of Du Bois-Reymond will always open the doors wide to supernaturalism. For whenever one sets a limit to the knowledge of the human mind, there it will surely start the beginning of its belief in the “no longer knowable.”