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 iv
... observations , experiments , or theoretical discussions , as well as references to extended bibliographic lists of the subjects under treatment . These notes will enable students , or others interested , to look up the original sources ...
... observations , experiments , or theoretical discussions , as well as references to extended bibliographic lists of the subjects under treatment . These notes will enable students , or others interested , to look up the original sources ...
Page vii
... observed choosing by female , 115. Difficult to assume utility for many secondary sexual characters , 115 ... observations on 106 lizards , 123. Substitutionary theories of the origin of secondary CONTENTS . vii.
... observed choosing by female , 115. Difficult to assume utility for many secondary sexual characters , 115 ... observations on 106 lizards , 123. Substitutionary theories of the origin of secondary CONTENTS . vii.
Page 13
... observed facts , and certain inductions from these facts . The observed facts are : ( 1 ) the increase by multiplication in geometrical ratio of the individuals in every species , whatever the kind of reproduction which may be peculiar ...
... observed facts , and certain inductions from these facts . The observed facts are : ( 1 ) the increase by multiplication in geometrical ratio of the individuals in every species , whatever the kind of reproduction which may be peculiar ...
Page 18
... observed ; and that no recognised case of natural selec- tion really selecting has been observed . I hasten to repeat the names of the Ancon sheep , the Paraguay cattle , the Porto Santo rabbit , the Artemias of Schmankewitch , and the ...
... observed ; and that no recognised case of natural selec- tion really selecting has been observed . I hasten to repeat the names of the Ancon sheep , the Paraguay cattle , the Porto Santo rabbit , the Artemias of Schmankewitch , and the ...
Page 19
... observed species - forming , and to refer to Weldon's broad - and narrow - fronted crabs as a case of what may be an observa- tion of selection at work . But such a list , even if it could be extended to a score , or to a hundred , of ...
... observed species - forming , and to refer to Weldon's broad - and narrow - fronted crabs as a case of what may be an observa- tion of selection at work . But such a list , even if it could be extended to a score , or to a hundred , of ...
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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