The Origin of Species by Means of Natural Selection: Or the Preservation of Favored Races in the Struggle for LifeD. Appleton, 1904 - 435 páginas |
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Página vii
... structures variable - Parts developed in an unusual manner are highly variable ; specific characters more variable than ... structure with changed functions- Widely different organs in members of the same class , de- veloped from one and ...
... structures variable - Parts developed in an unusual manner are highly variable ; specific characters more variable than ... structure with changed functions- Widely different organs in members of the same class , de- veloped from one and ...
Página xi
... structure of the feet of certain mar- supial animals . On serial homologies , corrected . Mr. E. Ray Lankester on morphology . On the asexual reproduction of Chironomus . On the origin of rudimentary parts , corrected . Recapitulation ...
... structure of the feet of certain mar- supial animals . On serial homologies , corrected . Mr. E. Ray Lankester on morphology . On the asexual reproduction of Chironomus . On the origin of rudimentary parts , corrected . Recapitulation ...
Página 3
... structure and coadaptation which justly excites our admiration . Naturalists continually refer to external conditions , such as climate , food , & c . , as the only possible cause of variation . In one limited sense , as we shall here ...
... structure and coadaptation which justly excites our admiration . Naturalists continually refer to external conditions , such as climate , food , & c . , as the only possible cause of variation . In one limited sense , as we shall here ...
Página 9
... 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 14
... 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
adapted affinities allied species America ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied colour common continent crossed crustaceans degree developed difficulty distinct species domestic doubt effects eggs embryo existing extinct extremely facts favourable fertilised fertility flowers formation forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hybrids important individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ larvæ less living males mammals manner marsupials migration modified descendants natural selection naturalists nearly nest occasionally offspring organisation organs parent peculiar perfect pigeon pistil pollen present principle probably produced progenitor quadrupeds ranked remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive supposed swimbladder tend theory tion trees variability variations varieties vary whilst whole wings young