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and, like the recapitulation theory, merely illusions of the human imagination. An antithetic alternation is seen to be an iron necessity of the development as soon as it is perceived that an organism, an asexual one, must develop upon which germ-cells can arise; while the sexual generation, “the embryo” of embryologists, is called forth from one of these germ-cells to contain and to nourish the rest for a certain brief span of time. Moreover, the facts of development, which to some extent have been unearthed during the past fifteen years within this city, throw a flood of new light upon the crude materialism of modern embryological textbooks. The biophores of Weismann and the pangens of De Vries become shadowy entities of the real existences of which there are no evidences. And while with humility admitting that to say it is to furnish no explanation of the riddle of life, it must be recognized that the characters or qualities of animals or plants are certainly not present in the germ in the shape of ultra-microscopic particles of chromatin, the pangens or biophores, but that all the wonderful and infinite variety of animate nature has its fount in unconscious memories of germ-cells.*
Modern embryology, not to be confused with that extant in textbooks, claims as its own two vastly important regions of human knowledge. These are the facts and nature of heredity and genetic variation and
* For a fuller account of the theory of heredity based in the unconscious memories of germ-cells, set up by Professor Ewald Hering, now Director of the Physiological Institute in the University of Leipzic, in 1870, see Beard, J.: “Philosophical Biology,” in Ainsworth Davis’s “Science of To-Day,” vol. ii., 1909, pp. 37-64, with list of literature, which should also include Samuel Butler’s “Unconscious Memory,” first edition, 1880, revised edition, 1910 (Fifield, London), and the presidential address to the British Association for the Advancement of Science, 1908, by Professor Francis Darwin.