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Goette recalls the fact that M. Wagner tried to supplement natural selection with his "Law of Migration," and that later on, Romanes and Gulick endeavored to supply the evident deficiencies in Darwin's theory, by invoking other principles; and that even at that time, Askenasy, Braun, and Naegeli and more recently, the lately deceased Eimer insisted on the fact of definitely ordered variations, in opposition to the theory of Selection.
Eimer therefore belongs to the class of naturalists, like Wigand, Askenasy, Naegeli, and many others, who reject the purely mechanical trend of Darwinism and recognize an "immanent principle of development." He seeks the essential cause of evolution in the constitution of the plasm of organisms.
These are represented by the names of workers belonging to a generation which has for the most part already passed away: Darwin’s collaborateurs, such as Alfred Russel Wallace, who independently and simultaneously expounded the theory of natural selection, Haeckel and Fritz Müller, Nägeli and Askenasy, von Kölliker, Mivart, Romanes and others.
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