The Origin of Species by Means of Natural Selection,: Or the Preservation of Favoured Races in the Struggle for LifeJohn Murray, Albemarle Street., 1891 - 432페이지 |
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83개의 결과 중 6 - 10개
xiv 페이지
... effects of habit . To this latter agency he seems to attribute all the beautiful adapta- tions in nature ; -such as the long neck of the giraffe for browsing on the branches of trees . But he likewise believed in a law of progressive ...
... effects of habit . To this latter agency he seems to attribute all the beautiful adapta- tions in nature ; -such as the long neck of the giraffe for browsing on the branches of trees . But he likewise believed in a law of progressive ...
xvii 페이지
... effects produced by the conditions of life are gradual . He argues with much force on general grounds that species are not immutable productions . But I cannot see how the two supposed " impulses " account in a scientific sense for the ...
... effects produced by the conditions of life are gradual . He argues with much force on general grounds that species are not immutable productions . But I cannot see how the two supposed " impulses " account in a scientific sense for the ...
2 페이지
... effects of external conditions , or of habit , or of the volition of the plant itself . It is , therefore , of the highest importance to gain a clear insight into the means of modification and coadaptation . At the. 2 INTRODUCTION .
... effects of external conditions , or of habit , or of the volition of the plant itself . It is , therefore , of the highest importance to gain a clear insight into the means of modification and coadaptation . At the. 2 INTRODUCTION .
5 페이지
... Effects of habit and the use or disuse of parts - Corre- lated variation - Inheritance - Character of domestic varieties - Difficulty of distinguishing between varieties and species - Origin of domestic varieties from one or more ...
... Effects of habit and the use or disuse of parts - Corre- lated variation - Inheritance - Character of domestic varieties - Difficulty of distinguishing between varieties and species - Origin of domestic varieties from one or more ...
6 페이지
... effects on the offspring are either definite or indefinite . They may be considered as definite when all or nearly all the offspring of individuals exposed to certain conditions during several genera- tions are modified in the same ...
... effects on the offspring are either definite or indefinite . They may be considered as definite when all or nearly all the offspring of individuals exposed to certain conditions during several genera- tions are modified in the same ...
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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