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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... offspring not universal - Hybrids and mongrels compared independently of their fertility - Summary .. .. Page 1 CHAPTER X. ON THE IMPERFECTION OF THE GEOLOGICAL RECORD . On the absence of intermediate varieties at the present day - On ...
... offspring not universal - Hybrids and mongrels compared independently of their fertility - Summary .. .. Page 1 CHAPTER X. ON THE IMPERFECTION OF THE GEOLOGICAL RECORD . On the absence of intermediate varieties at the present day - On ...
1 페이지
... offspring not uni- versal - Hybrids and mongrels compared independently of their fertility - Summary . THE view commonly entertained by naturalists is that species , when intercrossed , have been specially endowed with sterility , in ...
... offspring not uni- versal - Hybrids and mongrels compared independently of their fertility - Summary . THE view commonly entertained by naturalists is that species , when intercrossed , have been specially endowed with sterility , in ...
2 페이지
... offspring . Hybrids , on the other hand , have their reproductive organs functionally impotent , as may be clearly seen in the state of the male element in both plants and animals ; though the formative organs themselves are perfect in ...
... offspring . Hybrids , on the other hand , have their reproductive organs functionally impotent , as may be clearly seen in the state of the male element in both plants and animals ; though the formative organs themselves are perfect in ...
3 페이지
... offspring , with the average number produced by both pure parent - species in a state of nature . But causes of serious error here intervene : a plant , to be hybridised , must be castrated , and , what is often more important , must be ...
... offspring , with the average number produced by both pure parent - species in a state of nature . But causes of serious error here intervene : a plant , to be hybridised , must be castrated , and , what is often more important , must be ...
5 페이지
... offspring ; and both sexual elements in hybrid plants are already affected in some degree . But I believe that their fertility has been diminished in nearly all these cases by an independent cause , namely , by too close inter- breeding ...
... offspring ; and both sexual elements in hybrid plants are already affected in some degree . But I believe that their fertility has been diminished in nearly all these cases by an independent cause , namely , by too close inter- breeding ...
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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