The Origin of Species by Means of Natural Selection: Or, The Preservation of Favored Races in the Struggle for Life, 2±ÇD. Appleton, 1898 |
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14 ÆäÀÌÁö
... character , is sufficient to prevent two species crossing . It can be shown that plants most widely different in habit and general appearance , and having strongly marked differ- ences in every part of the flower , even in the pollen ...
... character , is sufficient to prevent two species crossing . It can be shown that plants most widely different in habit and general appearance , and having strongly marked differ- ences in every part of the flower , even in the pollen ...
15 ÆäÀÌÁö
... character between their two parents , always closely resemble one of them ; and such hybrids , though externally so like one of their pure parent- species , are with rare exceptions extremely sterile . So again amongst hybrids which are ...
... character between their two parents , always closely resemble one of them ; and such hybrids , though externally so like one of their pure parent- species , are with rare exceptions extremely sterile . So again amongst hybrids which are ...
32 ÆäÀÌÁö
... character and behaviour between illegitimate plants and hybrids . It is hardly an exaggeration to maintain that illegitimate plants are hybrids , produced within the limits of the same species by the improper union of certain forms ...
... character and behaviour between illegitimate plants and hybrids . It is hardly an exaggeration to maintain that illegitimate plants are hybrids , produced within the limits of the same species by the improper union of certain forms ...
39 ÆäÀÌÁö
... characters in his domestic varieties , and from such varieties not having been exposed for very long periods to uniform conditions of life ; -from these several considerations we may conclude that fer- tility does not constitute a ...
... characters in his domestic varieties , and from such varieties not having been exposed for very long periods to uniform conditions of life ; -from these several considerations we may conclude that fer- tility does not constitute a ...
43 ÆäÀÌÁö
... character , but closely resemble one of their parents ; but this does sometimes occur with hybrids , yet I grant much ... characters which have been slowly acquired through selection . A tendency to sud- den reversions to the perfect ...
... character , but closely resemble one of their parents ; but this does sometimes occur with hybrids , yet I grant much ... characters which have been slowly acquired through selection . A tendency to sud- den reversions to the perfect ...
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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 larv©¡ less living mammals manner marine Marsupials migration modified descendants mongrels mountains natural selection naturalists nearly occur oceanic islands offspring organisation pal©¡ontologists Pal©¡ozoic 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