The Origin of Species by Means of Natural Selection Or, The Preservation of Favored Races in the Struggle for LifeD. Appleton and Company, 1882 - 458페이지 |
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v 페이지
... Variability - Effects of Habit and the use or disuse of Parts Correlated Variation — Inheritance - Character of Domestic Varieties -Difficulty of distinguishing between Varieties and Species - Origin of Domestic Varieties from one or ...
... Variability - Effects of Habit and the use or disuse of Parts Correlated Variation — Inheritance - Character of Domestic Varieties -Difficulty of distinguishing between Varieties and Species - Origin of Domestic Varieties from one or ...
3 페이지
... variability of species in a state of nature ; but I shall , unfortunately , be compelled to treat this subject far too briefly , as it can be treated properly only by giving long catalogues of facts . We shall , however , be enabled to ...
... variability of species in a state of nature ; but I shall , unfortunately , be compelled to treat this subject far too briefly , as it can be treated properly only by giving long catalogues of facts . We shall , however , be enabled to ...
5 페이지
... Variability . WHEN We compare the individuals of the same variety or sub- variety of our older cultivated plants and animals , one of the first points which strikes us is , that they generally differ more from each other than do the ...
... Variability . WHEN We compare the individuals of the same variety or sub- variety of our older cultivated plants and animals , one of the first points which strikes us is , that they generally differ more from each other than do the ...
6 페이지
... variability is a much more common result of changed conditions than definite variability , and has probably played a more important part in the formation of our domestic races . We see indefinite variability in the endless slight ...
... variability is a much more common result of changed conditions than definite variability , and has probably played a more important part in the formation of our domestic races . We see indefinite variability in the endless slight ...
7 페이지
... variability is thus induced , partly from the fact of this system being extremely sensitive to any change in the con- ditions , and partly from the similarity , as Köireuter and others have remarked , between the variability which ...
... variability is thus induced , partly from the fact of this system being extremely sensitive to any change in the con- ditions , and partly from the similarity , as Köireuter and others have remarked , between the variability which ...
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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 formations formerly forms fossil Fritz Müller genera genus geological 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 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 theory tion variability variations varieties vary whilst whole wings young