The Origin of Species by Means of Natural Selection: Or, The Preservation of Favored Races in the Struggle for Life, 2권D. Appleton, 1898 |
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55개의 결과 중 1 - 5개
페이지
... hybrids- Sterility 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 ...
... hybrids- Sterility 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 ...
1 페이지
... hybrids- Sterility 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 ...
... hybrids- Sterility 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 ...
2 페이지
... Hybrids , on the other hand , have their reproductive organs functionally impotent , as may be clearly seen in the ... hybrid offspring . It. 2 [ CHAP . IX . HYBRIDISM .
... Hybrids , on the other hand , have their reproductive organs functionally impotent , as may be clearly seen in the ... hybrid offspring . It. 2 [ CHAP . IX . HYBRIDISM .
3 페이지
... hybrid offspring . It is impossible to study the several memoirs and works of those two conscientious and admirable observers , Köl- reuter and Gärtner , who almost devoted their lives to this subject , without being deeply impressed ...
... hybrid offspring . It is impossible to study the several memoirs and works of those two conscientious and admirable observers , Köl- reuter and Gärtner , who almost devoted their lives to this subject , without being deeply impressed ...
4 페이지
... hybrids in successive generations ; though Gärtner was enabled to rear some hybrids , carefully guarding them from a cross with either pure parent , for six or seven , and in one case for ten generations , yet he asserts positively that ...
... hybrids in successive generations ; though Gärtner was enabled to rear some hybrids , carefully guarding them from a cross with either pure parent , for six or seven , and in one case for ten generations , yet he asserts positively that ...
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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 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