The Origin of Species by Means of Natural Selection: Or, The Preservation of Favored Races in the Struggle for Life, Volumen2D. Appleton, 1898 |
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... varieties at the present day - On the nature of extinct intermediate varieties ; on their number- On the lapse of time , as inferred from the rate of denudation and of deposition - On the lapse of time as estimated by years -On the ...
... varieties at the present day - On the nature of extinct intermediate varieties ; on their number- On the lapse of time , as inferred from the rate of denudation and of deposition - On the lapse of time as estimated by years -On the ...
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... varieties - De- scent always used in classification - Analogical or adaptive char- acters -Affinities , general , complex , and radiating - Extinction separates and defines groups - MORPHOLOGY , between members of the same class ...
... varieties - De- scent always used in classification - Analogical or adaptive char- acters -Affinities , general , complex , and radiating - Extinction separates and defines groups - MORPHOLOGY , between members of the same class ...
Página 1
... 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 naturalists is that species , when intercrossed , have ...
... 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 naturalists is that species , when intercrossed , have ...
Página 2
... varieties , that is of the forms known or believed to be descended from common parents , when crossed , and likewise the fertility of their mongrel off- spring , is , with reference to my theory , of equal im- portance with the ...
... varieties , that is of the forms known or believed to be descended from common parents , when crossed , and likewise the fertility of their mongrel off- spring , is , with reference to my theory , of equal im- portance with the ...
Página 3
... varieties . Gärt- ner , also , makes the rule equally universal ; and he dis- putes the entire fertility of Kölreuter's ten cases . But in these and in many other cases , Gärtner is obliged carefully to count the seeds , in order to ...
... varieties . Gärt- ner , also , makes the rule equally universal ; and he dis- putes the entire fertility of Kölreuter's ten cases . But in these and in many other cases , Gärtner is obliged carefully to count the seeds , in order to ...
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Términos y frases comunes
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