I. Haeckel and His Opponents

Thus, by investigating the relationship of individual developmental history (ontogeny) to the history of the race (phylogeny), Haeckel has given the scientific explanation of the manifold organic forms.[^3] As a natural philosopher he has satisfied the human demand for knowledge, which Schiller had derived from observation of Goethe's mind; he ascended from the simple organisations step by step to the more complicated, to finally build up genetically the most complex of all, man, from the materials of the whole structure of Nature. He has set forth his view in several grandly designed works—in his General Morphology (1866), in his Natural History of Creation (1868), in his Anthropogenesis (1874)—in which he “undertook the first and hitherto the only attempt to establish critically in detail the zoological family-tree of man, and to discuss at length the entire animal ancestry of our race.” To these works there has been further added in recent years his three-volumed Systematic Phylogeny.