The Origin of Species by Means of Natural Selection,: Or the Preservation of Favoured Races in the Struggle for LifeAppleton, 1898 - 432 páginas |
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Página 3
... distinct species , quite fertile to- gether , he unhesitatingly ranks them as varieties . 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 other ...
... distinct species , quite fertile to- gether , he unhesitatingly ranks them as varieties . 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 other ...
Página 6
... distinct flower , either from the same plant or from another plant of the same hybrid nature . And thus , the strange fact of an increase of fertility in the successive genera- tions of artificially fertilised hybrids , in contrast with ...
... distinct flower , either from the same plant or from another plant of the same hybrid nature . And thus , the strange fact of an increase of fertility in the successive genera- tions of artificially fertilised hybrids , in contrast with ...
Página 7
... 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 . In the genus Hippeastrum , in Cory- dalis as shown by Professor Hildebrand , in ...
... 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 . In the genus Hippeastrum , in Cory- dalis as shown by Professor Hildebrand , in ...
Página 8
... distinct from each other as are the genera of plants , then we may infer that animals more widely distinct in the scale of nature can be crossed more easily than in the case of plants ; but the hybrids themselves are , I think , more ...
... distinct from each other as are the genera of plants , then we may infer that animals more widely distinct in the scale of nature can be crossed more easily than in the case of plants ; but the hybrids themselves are , I think , more ...
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 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