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 13
... common camel , prevented their domestication ? I cannot doubt that if other animals and plants , equal in number to our domesticated productions , and belonging to equally diverse classes and countries , were taken from a state of ...
... common camel , prevented their domestication ? I cannot doubt that if other animals and plants , equal in number to our domesticated productions , and belonging to equally diverse classes and countries , were taken from a state of ...
Página 14
... common cattle , may , indeed , be looked upon as established by the admirable re- searches of Professor Rütimeyer . With respect to horses , from reasons which I cannot here give , I am doubtfully inclined to believe , in opposition to ...
... common cattle , may , indeed , be looked upon as established by the admirable re- searches of Professor Rütimeyer . With respect to horses , from reasons which I cannot here give , I am doubtfully inclined to believe , in opposition to ...
Página 17
... common opinion of naturalists is correct , namely , that all are descended from the rock - pigeon ( Columba livia ) , including under this term several geographical races or sub - species , which differ from each other in the most ...
... common opinion of naturalists is correct , namely , that all are descended from the rock - pigeon ( Columba livia ) , including under this term several geographical races or sub - species , which differ from each other in the most ...
Página 21
... common parent , as any naturalist could in coming to a similar conclusion in regard to the many species of finches , or other groups of birds , in nature . One circumstance has struck me much ; namely , that nearly all the breeders of ...
... common parent , as any naturalist could in coming to a similar conclusion in regard to the many species of finches , or other groups of birds , in nature . One circumstance has struck me much ; namely , that nearly all the breeders of ...
Página 28
... common goose has not given rise to any marked varieties ; hence the Tou- louse and the common breed , which differ only in colour , that mot fleeting of characters , have lately been exhibited as distinct 28 CHAP . 1 Unconscious Selection .
... common goose has not given rise to any marked varieties ; hence the Tou- louse and the common breed , which differ only in colour , that mot fleeting of characters , have lately been exhibited as distinct 28 CHAP . 1 Unconscious Selection .
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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