The Origin of Species by Means of Natural Selection, Or, The Preservation of Favored Races in the Struggle for Life, 2권D. Appleton, 1896 |
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57개의 결과 중 1 - 5개
1 페이지
... seems at first highly probable , for species living together could hardly have been kept distinct had they been capable of freely crossing . The subject is in many ways important for us , more especially as the sterility of species when ...
... seems at first highly probable , for species living together could hardly have been kept distinct had they been capable of freely crossing . The subject is in many ways important for us , more especially as the sterility of species when ...
2 페이지
... seems to make a broad and clear distinction between varieties and species . Degrees of Sterility . - First , for the sterility of specics when crossed and of their hybrid offspring . It is 2 [ CHAP . IX . HYBRIDISM .
... seems to make a broad and clear distinction between varieties and species . Degrees of Sterility . - First , for the sterility of specics when crossed and of their hybrid offspring . It is 2 [ CHAP . IX . HYBRIDISM .
10 페이지
... seems by far the most probable , and can , indeed , hardly be doubted . It is , for instance , almost certain that our dogs are descended from several wild stocks ; yet . with perhaps the exception of certain indigenous domestic dogs of ...
... seems by far the most probable , and can , indeed , hardly be doubted . It is , for instance , almost certain that our dogs are descended from several wild stocks ; yet . with perhaps the exception of certain indigenous domestic dogs of ...
17 페이지
... seems a strange arrangement . The foregoing rules and facts , on the other hand , appear to me clearly to indicate that the sterility both of first crosses and of hybrids is simply incidental or dependent on unknown differences in their ...
... seems a strange arrangement . The foregoing rules and facts , on the other hand , appear to me clearly to indicate that the sterility both of first crosses and of hybrids is simply incidental or dependent on unknown differences in their ...
20 페이지
... seem to indicate that the greater or lesser difficulty of either grafting or crossing various species has been a special endowment ; although in the case of crossing , the difficulty is as important for the endurance and stability of ...
... seem to indicate that the greater or lesser difficulty of either grafting or crossing various species has been a special endowment ; although in the case of crossing , the difficulty is as important for the endurance and stability of ...
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accumulated adapted admit affinity allied species ancient animals appear Archipelago arctic areas become believe birds breeds Cambrian changes characters classification climate closely allied continent crustaceans degree deposited difficulty distant distinct species domestic doubt embryo 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 mammæ mammals manner marine Marsupials migration modified descendants mongrels mountains natural selection naturalists nearly occur oceanic islands offspring organisation palæontologists paleozoic 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 species belonging stage stamens sterility structure successive suppose terrestrial tertiary tion variations varieties whilst widely different wings