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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viii 페이지
... intermediate varieties at the present day - On the nature of extinct intermediate varieties ; on their number - On the lapse of time , as inferred from the rate of denudation and of deposition - On the lapse of time as estimated by ...
... intermediate varieties at the present day - On the nature of extinct intermediate varieties ; on their number - On the lapse of time , as inferred from the rate of denudation and of deposition - On the lapse of time as estimated by ...
14 페이지
... intermediate between their parents ; and if we account for our several domestic races by this process , we must admit the former existence of the most extreme forms , as the Italian greyhound , bloodhound , bull - dog , etc. , in the ...
... intermediate between their parents ; and if we account for our several domestic races by this process , we must admit the former existence of the most extreme forms , as the Italian greyhound , bloodhound , bull - dog , etc. , in the ...
33 페이지
... intermediate gradations , it is probable that they were once thus connected . Mr. Wallace , for instance , describes a certain butterfly which presents in the same island a great range of varieties connected by intermediate links , and ...
... intermediate gradations , it is probable that they were once thus connected . Mr. Wallace , for instance , describes a certain butterfly which presents in the same island a great range of varieties connected by intermediate links , and ...
34 페이지
... intermediate links ; nor will the commonly - assumed hybrid nature of the intermediate forms always remove the difficulty . In very many cases , however , one form is ranked as a variety of another , not because the inter- mediate links ...
... intermediate links ; nor will the commonly - assumed hybrid nature of the intermediate forms always remove the difficulty . In very many cases , however , one form is ranked as a variety of another , not because the inter- mediate links ...
36 페이지
... intermediate links connecting the several forms should now be found . The naturalist thus loses his best guide in determining whether to rank doubtful forms as varieties or species . This likewise necessarily occurs with closely allied ...
... intermediate links connecting the several forms should now be found . The naturalist thus loses his best guide in determining whether to rank doubtful forms as varieties or species . This likewise necessarily occurs with closely allied ...
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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