On the Origin of Species by Means of Natural Selection, Or, The Preservation of Favoured Races in the Struggle for LifeAppleton, 1898 |
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59개의 결과 중 1 - 5개
v 페이지
... crossing - Dimorphism and trimorphism - Fertility of varieties when crossed and of their mongrel offspring not uni- versal - Hybrids and mongrels compared independently of their fertility - Summary Page 1 CHAPTER X. ON THE IMPERFECTION ...
... crossing - Dimorphism and trimorphism - Fertility of varieties when crossed and of their mongrel offspring not uni- versal - Hybrids and mongrels compared independently of their fertility - Summary Page 1 CHAPTER X. ON THE IMPERFECTION ...
ix 페이지
... crossing - Dimorphism and trimorphism - Fertility of varieties when crossed and of their mongrel offspring not uni- versal - Hybrids and mongrels compared independently of their fertility - Summary . THE view commonly entertained by ...
... crossing - Dimorphism and trimorphism - Fertility of varieties when crossed and of their mongrel offspring not uni- versal - Hybrids and mongrels compared independently of their fertility - Summary . THE view commonly entertained by ...
2 페이지
... crossed , and the sterility of the hybrids produced from them . Pure species have of course their organs of reproduc- tion in a perfect condition , yet when intercrossed they produce either few or no offspring . Hybrids , on the other ...
... crossed , and the sterility of the hybrids produced from them . Pure species have of course their organs of reproduc- tion in a perfect condition , yet when intercrossed they produce either few or no offspring . Hybrids , on the other ...
3 페이지
... crossed , and the maximum produced by their hybrid 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 ...
... crossed , and the maximum produced by their hybrid 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 ...
4 페이지
... crossed is so different in degree and graduates away so insensibly , and , on the other hand , that the fertility of pure species is so easily affected by various circumstances , that for all practical purposes it is most difficult to ...
... crossed is so different in degree and graduates away so insensibly , and , on the other hand , that the fertility of pure species is so easily affected by various circumstances , that for all practical purposes it is most difficult to ...
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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