Darwinism To-day: A Discussion of Present-day Scientific Criticism of the Darwinian Selection Theories, Together with a Brief Account of the Principal Other Proposed Auxiliary and Alternative Theories of Species-forming |
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acquired characters acters actual adaptation advantage animals appear artificial selection basis believe biological biologists biophors birds breeding capacity cells characteristics colour complex congenital variations crabs criticism Darwin Darwin'schen Darwinian Darwinian variations Darwinismus definite Delage determinants direct effects Eimer environment example explain fact factor favourable female fluctuating variations follows functional gemmules germ-cells germ-plasm germinal selection groups heredity heterogenesis individuals Individuen influence inheritance of acquired insects isolation kind können Lamarckian Lamarckism larvæ less males ment modification mutations theory natural selection natural selection theory neo-Darwinism objection observed occur offspring ontogenetic organic evolution origin of species orthogenesis pangenes panmixia parents Parus rufescens phenomena physiological plants Plate principle produced protoplasm race recognised result says Science secondary sexual characters Selektion sexual selection slight specialisation species-forming stimuli structure struggle for existence survival teleology theory of descent theory of species-forming variability variety varying Vries Vries's Weismann Wolff