Madame Foerster did her utmost to enrol Dr. Steiner under her brother's flag. For this she used all her skill, making repeated offers to the young publicist to become editor and commentator of Nietzsche's works. Steiner withstood her insistence as best he could, and ended by taking himself off altogether, for which Madame Foerster never forgave him. She did not know that Rudolf Steiner bore within him the consciousness of a work no less great and more valuable than that of her brother. Nietzsche had been merely an interesting episode in the life of the esoteric thinker on the threshold of his battlefield. His meeting with the celebrated naturalist, Ernst Haeckel, on the contrary, marks a most important phase in the development of his thought. Was not the successor of Darwin apparently the most formidable adversary of the spiritualism of this young initiate, of that philosophy which to him was the very essence of his being and the breath of his thought? Indeed, since the broken link between man and animal has been re-joined, since man can no longer believe in a special and supernatural origin, he has begun altogether to doubt his divine origin and destiny. He no longer sees himself as anything but one phenomenon among so many phenomena, a passing form amidst so many forms, a frail and chance link in a blind evolution. Steiner, then, is right in saying: "The mentality deduced from natural sciences is the greatest power of modern times." On the other hand, he knew that this system merely reproduces a succession of external forms among living beings, and not the inner and acting forces of life. He knew it from personal initiation, and a deeper and vaster view of the universe. So also he could exclaim with more assurance than most of our timid spiritualists and startled theologians: "Is the human soul then to rise on the wings of enthusiasm to the summits of the True, the Beautiful and the Good, only to be swept away into nothingness, like a bubble of the brain?" Yes, Haeckel was the Adversary. It was materialism in arms, the dragon with all his scales, his claws, and his teeth. Steiner's desire to understand this man, and to do him justice as to all that was great in him, to fathom his theory so far as it was logical and plausible, was only the more intense. In this fact one sees all the loyalty and all the greatness of his comprehensive mind. The materialistic conclusions of Haeckel could have no influence on his own ideas which came to him from a different science; but he had a presentment that in the indisputable discoveries of the naturalist he should find the surest basis of an evolutionary spiritualism and a rational theosophy.