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 10
... look at the inheritance of every character whatever as the rule , and non - inheritance as the anomaly . The laws governing inheritance are for the most part unknown . No one can say why the same peculiarity in different individuals of ...
... look at the inheritance of every character whatever as the rule , and non - inheritance as the anomaly . The laws governing inheritance are for the most part unknown . No one can say why the same peculiarity in different individuals of ...
Página 12
... look to the hereditary varieties or races of our domestic animals and plants , and compare them with closely allied species , we generally perceive in each domestic race , as already remarked , less uniformity of character than in true ...
... look to the hereditary varieties or races of our domestic animals and plants , and compare them with closely allied species , we generally perceive in each domestic race , as already remarked , less uniformity of character than in true ...
Página 18
... look in vain through the whole great family of Columbidæ for a beak like that of the English carrier , or that of the short - faced tumbler , or barb ; for reversed feathers like those of the Jacobin ; for a crop like that of the pouter ...
... look in vain through the whole great family of Columbidæ for a beak like that of the English carrier , or that of the short - faced tumbler , or barb ; for reversed feathers like those of the Jacobin ; for a crop like that of the pouter ...
Página 22
... look further than to mere variability . We cannot suppose that all the breeds were suddenly produced as perfect and as useful as we now see them ; indeed , in many cases , we know that this has not been their history . The key is man's ...
... look further than to mere variability . We cannot suppose that all the breeds were suddenly produced as perfect and as useful as we now see them ; indeed , in many cases , we know that this has not been their history . The key is man's ...
Página 40
... Look at the common oak , how closely it has been studied ; yet a German author makes more than a dozen species out of forms , which are almost universally considered by other botanists to be varieties ; and in this country the highest ...
... Look at the common oak , how closely it has been studied ; yet a German author makes more than a dozen species out of forms , which are almost universally considered by other botanists to be varieties ; and in this country the highest ...
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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