On the Origin of Species by Means of Natural Selection, Or, The Preservation of Favoured Races in the Struggle for LifeAppleton, 1898 - 432페이지 |
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vi 페이지
... living species - On the state of development of ancient forms— On the succession of the same types within the same areas— Summary of preceding and present chapter · Page 89 CHAPTER XII . GEOGRAPHICAL DISTRIBUTION . Present distribution ...
... living species - On the state of development of ancient forms— On the succession of the same types within the same areas— Summary of preceding and present chapter · Page 89 CHAPTER XII . GEOGRAPHICAL DISTRIBUTION . Present distribution ...
ix 페이지
... living together could hardly have been kept dis- tinct had they been capable of freely crossing . The subject is in many ways important for us , more especial- ly as the sterility of species when first crossed , and that of their hybrid ...
... living together could hardly have been kept dis- tinct had they been capable of freely crossing . The subject is in many ways important for us , more especial- ly as the sterility of species when first crossed , and that of their hybrid ...
24 페이지
... living in a country where their two parents live , they are generally placed under suitable conditions of life . But a hybrid par- takes of only half of the nature and constitution of its mother ; it may therefore before birth , as long ...
... living in a country where their two parents live , they are generally placed under suitable conditions of life . But a hybrid par- takes of only half of the nature and constitution of its mother ; it may therefore before birth , as long ...
27 페이지
... living things . We see this acted on by farmers and gardeners in their frequent exchanges of seed , tubers , & c . , from one soil or climate to another , and back again . During the con- valescence of animals , great benefit is derived ...
... living things . We see this acted on by farmers and gardeners in their frequent exchanges of seed , tubers , & c . , from one soil or climate to another , and back again . During the con- valescence of animals , great benefit is derived ...
50 페이지
... living forms might have descended from the other ; for instance , a horse from a tapir ; and in this case direct intermediate links will have existed between them . But such a case would imply that one form had re- mained for a very ...
... living forms might have descended from the other ; for instance , a horse from a tapir ; and in this case direct intermediate links will have existed between them . But such a case would imply that one form had re- mained for a very ...
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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