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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Page 34
... survival of the fittest . " This problem of the existence or non - existence of deter- minate variation is taken up in such detail in connection with the explanation and discussion of various auxiliary or alter- native theories of ...
... survival of the fittest . " This problem of the existence or non - existence of deter- minate variation is taken up in such detail in connection with the explanation and discussion of various auxiliary or alter- native theories of ...
Page 40
... survival of the fittest does not account for them . The fact that species are so com- monly separated by characters that seem to be absolutely useless has led some of our keenest naturalists to insist that the survival of the fittest ...
... survival of the fittest does not account for them . The fact that species are so com- monly separated by characters that seem to be absolutely useless has led some of our keenest naturalists to insist that the survival of the fittest ...
Page 41
... survival of the fittest has been concerned in the development of them all . If this is true , the survival of the fittest explains the origin of species as well DARWINISM ATTACKED . 41.
... survival of the fittest has been concerned in the development of them all . If this is true , the survival of the fittest explains the origin of species as well DARWINISM ATTACKED . 41.
Page 43
... survival becomes very great . When finally we come to characters of specific nature connected with colour markings which are invisible when the animal is alive , there is apparently no resource left except to con- clude that the ...
... survival becomes very great . When finally we come to characters of specific nature connected with colour markings which are invisible when the animal is alive , there is apparently no resource left except to con- clude that the ...
Page 57
... survival than favourable variations was the fact of approach to the species type or mode of variability . The extreme variants perished . " The process of selective elimination is most severe with ex- tremely variable individuals , no ...
... survival than favourable variations was the fact of approach to the species type or mode of variability . The extreme variants perished . " The process of selective elimination is most severe with ex- tremely variable individuals , no ...
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Common terms and phrases
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