The Origin of Species by Means of Natural Selection,: Or the Preservation of Favoured Races in the Struggle for LifeJohn Murray, Albemarle Street., 1891 - 432 páginas |
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Página vii
... structures -Causes which interfere with the acquisition through natural selection of useful structures - Gradations of structure with changed functions- Widely different organs in members of the same class , developed from one and the ...
... structures -Causes which interfere with the acquisition through natural selection of useful structures - Gradations of structure with changed functions- Widely different organs in members of the same class , developed from one and the ...
Página xii
... structures . There is also a discussion on the causes which prevent in many cases the acquisition through natural ... structure of the feet of certain marsupial animals . On serial homologies , corrected . Mr. E. Ray Lankester on ...
... structures . There is also a discussion on the causes which prevent in many cases the acquisition through natural ... structure of the feet of certain marsupial animals . On serial homologies , corrected . Mr. E. Ray Lankester on ...
Página 2
... structure and coadaptation which justly excites our admiration . Naturalists continually refer to external conditions , such as climate , food , etc. , as the only possible cause of variation . In one limited sense , as we shall ...
... structure and coadaptation which justly excites our admiration . Naturalists continually refer to external conditions , such as climate , food , etc. , as the only possible cause of variation . In one limited sense , as we shall ...
Página 6
... structure so strongly pronounced as to deserve to be called monstrosities arise ; but monstrosities cannot be separated by any distinct line from slighter variations . All such changes of structure , whether extremely slight or strongly ...
... structure so strongly pronounced as to deserve to be called monstrosities arise ; but monstrosities cannot be separated by any distinct line from slighter variations . All such changes of structure , whether extremely slight or strongly ...
Página 9
... structure , owing to the mysterious laws of correlation . The results of the various , unknown , or but dimly understood laws of variation are infinitely complex and diversified . It is well worth while carefully to study the several ...
... structure , owing to the mysterious laws of correlation . The results of the various , unknown , or but dimly understood laws of variation are infinitely complex and diversified . It is well worth while carefully to study the several ...
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Términos y frases comunes
accumulated adapted admit affinities allied species America analogous ancient appear beak become bees believe belonging birds breeds cause cells characters climate closely allied colour continued crossed crustaceans degree developed difficulty distinct species domestic animals doubt effects eggs embryo existing extinct extremely facts favourable female fertilised fertility flowers formation formerly forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number habits Hence hybrids important increase individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ larvæ less living male mammals manner Marsupials migration modified descendants natural selection naturalists nearly nest occasionally occur oceanic islands offspring organisation organs parent peculiar perfect pigeon pistil pollen present preserved principle probably produced quadrupeds ranked reciprocal crosses remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive supposed tend theory tion variability variations varieties vary whilst whole wings young