The Origin of Species by Means of Natural Selection: Or, The Preservation of Favored Races in the Struggle for Life, Volumen2D. Appleton, 1898 |
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Página 3
... distinct species , quite fertile to- gether , he unhesitatingly ranks them as varieties . Gärt- ner , also , makes the rule equally universal ; and he dis- putes the entire fertility of Kölreuter's ten cases . But in these and in many ...
... distinct species , quite fertile to- gether , he unhesitatingly ranks them as varieties . Gärt- ner , also , makes the rule equally universal ; and he dis- putes the entire fertility of Kölreuter's ten cases . But in these and in many ...
Página 6
... species - as are Kölreuter and Gärtner that some degree of sterility between distinct species is a universal law of nature . He experimented on some of the very same species as did Gärtner . The difference in their results may , I think ...
... species - as are Kölreuter and Gärtner that some degree of sterility between distinct species is a universal law of nature . He experimented on some of the very same species as did Gärtner . The difference in their results may , I think ...
Página 7
... species of Lobelia , Verbascum and Passiflora , can easily be fertilised by pollen from a distinct species , but not by pollen from the same plant , though this pollen can be proved to be perfectly sound by fertilising other plants or ...
... species of Lobelia , Verbascum and Passiflora , can easily be fertilised by pollen from a distinct species , but not by pollen from the same plant , though this pollen can be proved to be perfectly sound by fertilising other plants or ...
Página 8
... species most widely dissimilar in general habit , produces itself as perfectly as if it had been a natural species from ... distinct from each other as are the genera of plants , then we may infer that animals more widely distinct in the ...
... species most widely dissimilar in general habit , produces itself as perfectly as if it had been a natural species from ... distinct from each other as are the genera of plants , then we may infer that animals more widely distinct in the ...
Página 9
... distinct species as the hare and rabbit , when they can be got to breed together , produce off- spring , which are highly fertile when crossed with one of the parent - species . The hybrids from the common and Chinese geese ( A ...
... distinct species as the hare and rabbit , when they can be got to breed together , produce off- spring , which are highly fertile when crossed with one of the parent - species . The hybrids from the common and Chinese geese ( A ...
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Términos y frases comunes
admit affinity allied species ancient animals appear Archipelago arctic areas become believe belonging birds Cambrian changes characters cies classification climate closely allied 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 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 palæontologists Palæozoic parent parent-form peculiar perfect pistil plants pollen present probably produced quadrupeds reciprocal crosses regions remains remarked reproductive resemblance rocks rudimentary organs seeds Silurian South America stage stamens sterility structure successive suppose terrestrial tertiary theory tion variations varieties whilst whole widely different wings