The Origin of Species by Means of Natural Selection: Or, The Preservation of Favored Races in the Struggle for Life, 2권D. Appleton, 1898 |
도서 본문에서
68개의 결과 중 1 - 5개
2 페이지
... parent- species . In treating this subject , two classes of facts , to a large extent fundamentally different , have ... parents , when crossed , and likewise the fertility of their mongrel off- spring , is , with reference to my theory ...
... parent- species . In treating this subject , two classes of facts , to a large extent fundamentally different , have ... parents , when crossed , and likewise the fertility of their mongrel off- spring , is , with reference to my theory ...
3 페이지
... 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 secluded in order to prevent pollen being brought to it ...
... 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 secluded in order to prevent pollen being brought to it ...
4 페이지
... enabled to rear some hybrids , carefully guarding them from a cross with either pure parent , for six or seven , and in one case for ten generations , yet he asserts positively that their fer-. 4 [ CHAP . IX . HYBRIDISM .
... enabled to rear some hybrids , carefully guarding them from a cross with either pure parent , for six or seven , and in one case for ten generations , yet he asserts positively that their fer-. 4 [ CHAP . IX . HYBRIDISM .
5 페이지
... parents , this is often transmitted in an augmented degree to the offspring ; and both sexual elements in hybrid plants ... parent - species , or other allied hybrids , generally grow in the same garden , the visits of insects must be ...
... parents , this is often transmitted in an augmented degree to the offspring ; and both sexual elements in hybrid plants ... parent - species , or other allied hybrids , generally grow in the same garden , the visits of insects must be ...
6 페이지
... parent - species - as are Kölreuter and Gärtner that some degree of sterility between distinct species is a universal law of nature . He experimented on some of the very same species as did Gärtner . The difference in their results may ...
... parent - species - as are Kölreuter and Gärtner that some degree of sterility between distinct species is a universal law of nature . He experimented on some of the very same species as did Gärtner . The difference in their results may ...
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자주 나오는 단어 및 구문
admit affinity allied species ancient animals appear Archipelago arctic areas become believe belonging birds Cambrian changes characters cies classification climate closely allied 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 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 palæontologists Palæozoic 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 stage stamens sterility structure successive suppose terrestrial tertiary theory tion variations varieties whilst whole widely different wings