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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17 페이지
... suppose it would be equally important to keep from blending together ? Why should the degree of sterility be innately variable in the individuals of the same species ? Why should some species cross with facility , and yet produce very ...
... suppose it would be equally important to keep from blending together ? Why should the degree of sterility be innately variable in the individuals of the same species ? Why should some species cross with facility , and yet produce very ...
18 페이지
Charles Darwin. nature , I presume that no one will suppose that this capacity is a specially endowed quality , but will admit that it is incidental on differences in the laws of growth of the two plants . We can sometimes see the reason ...
Charles Darwin. nature , I presume that no one will suppose that this capacity is a specially endowed quality , but will admit that it is incidental on differences in the laws of growth of the two plants . We can sometimes see the reason ...
32 페이지
... suppose that a botanist found two well - marked varieties ( and such occur ) of the long - styled form of the trimorphic Lythrum salicaria , and that he determined to try by crossing whether they were specifically distinct . He would ...
... suppose that a botanist found two well - marked varieties ( and such occur ) of the long - styled form of the trimorphic Lythrum salicaria , and that he determined to try by crossing whether they were specifically distinct . He would ...
50 페이지
... suppose that links directly intermediate between them ever existed , but between each and an unknown common parent . The common parent will have had in its whole organisation much general re- semblance to the tapir and to the horse ...
... suppose that links directly intermediate between them ever existed , but between each and an unknown common parent . The common parent will have had in its whole organisation much general re- semblance to the tapir and to the horse ...
67 페이지
... suppose that it then became extinct . We forget how small the area of Europe is compared with the rest of the world ; nor have the several stages of the same formation throughout Europe been correlated with perfect accuracy . We may ...
... suppose that it then became extinct . We forget how small the area of Europe is compared with the rest of the world ; nor have the several stages of the same formation throughout Europe been correlated with perfect accuracy . We may ...
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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