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
... 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
... 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
Charles Darwin. 66 a hybrid from Calceolaria integrifolia and plantaginea , species most widely dissimilar in general habit , re- produces itself as perfectly as if it had been a natural species ... distinct from each other as are the genera ...
Charles Darwin. 66 a hybrid from Calceolaria integrifolia and plantaginea , species most widely dissimilar in general habit , re- produces itself as perfectly as if it had been a natural species ... distinct from each other as are the genera ...
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