On the Origin of Species by Means of Natural Selection: Or The Preservation of Favored Races in the Struggle for Life, Volumen2D. Appleton, 1888 - 458 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 518 384 520 385 521 387 541 401 547 405 552 568 409 421 572 424 animals ...
... 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 518 384 520 385 521 387 541 401 547 405 552 568 409 421 572 424 animals ...
Página 2
... 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 ...
... 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 ...
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 . 99 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 . 99 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 admit affinities allied species America analogous ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied colour continued crossed crustaceans degree developed difficulty distinct species doubt effects eggs embryo existing extinct extremely facts favourable fertilised fertility flowers formation formerly forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number habits Hence hybrids important 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 reproductive resemblance rudimentary seeds sexual selection slight South America stamens sterility structure struggle successive supposed tend theory tion variability variations varieties vary whilst whole wings young