On the Origin of Species by Means of Natural Selection, Or, The Preservation of Favoured Races in the Struggle for LifeAppleton, 1898 |
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Página v
... various in degree , not universal , affected by close in- terbreeding , removed by domestication - Laws governing the sterility of hybrids - Sterility not a special endowment , but incidental on other differences , not accumulated by ...
... various in degree , not universal , affected by close in- terbreeding , removed by domestication - Laws governing the sterility of hybrids - Sterility not a special endowment , but incidental on other differences , not accumulated by ...
Página ix
... various in degree , not universal , affected by close in- terbreeding , removed by domestication - Laws governing the sterility of hybrids - Sterility not a special endowment , but incidental on other differences , not accumulated by ...
... various in degree , not universal , affected by close in- terbreeding , removed by domestication - Laws governing the sterility of hybrids - Sterility not a special endowment , but incidental on other differences , not accumulated by ...
Página 4
... various species when crossed is so different in degree and graduates away so insensibly , and , on the other hand , that the fertility of pure species is so easily affected by various circumstances , that for all practical purposes it ...
... various species when crossed is so different in degree and graduates away so insensibly , and , on the other hand , that the fertility of pure species is so easily affected by various circumstances , that for all practical purposes it ...
Página 7
... various or- chids as shown by Mr. Scott and Fritz Müller , all the individuals are in this peculiar condition . So that with some species , certain abnormal individuals , and in other species all the individuals , can actually be ...
... various or- chids as shown by Mr. Scott and Fritz Müller , all the individuals are in this peculiar condition . So that with some species , certain abnormal individuals , and in other species all the individuals , can actually be ...
Página 10
... various parts of the country ; and as they are kept for profit , where neither pure parent - species , exists , they must certainly be highly or perfectly fertile . With our domesticated animals , the various races when crossed together ...
... various parts of the country ; and as they are kept for profit , where neither pure parent - species , exists , they must certainly be highly or perfectly fertile . With our domesticated animals , the various races when crossed together ...
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Términos y frases comunes
admit affinity allied species ancient animals appear Archipelago arctic areas become believe birds Cambrian changes characters cies classification climate closely allied common progenitor continent crustaceans degree deposited difficulty distant distinct species domestic doubt embryo eral Europe existing extinct fact faunas fertilised fertility flowers formations formerly forms fossil fresh-water Fritz Müller Gärtner genera genus geological period geological record Glacial period groups of species habits hybrids hybrids produced important individuals inhabitants inherited insects instance intermediate intervals land larvæ less living mammals manner marine Marsupials migration modified descendants mongrels mountains natural selection naturalists nearly occur oceanic islands offspring organisation parent parent-form peculiar perfect pistil plants pollen present probably produced quadrupeds reciprocal crosses regions remains remarked reproductive resemblance rocks rudimentary organs sediment seeds Silurian South America stage stamens sterility structure successive suppose terrestrial tertiary theory tion variations varieties whilst widely different wings