The Origin of Species by Means of Natural Selection,: Or the Preservation of Favoured Races in the Struggle for LifeAppleton, 1898 - 432 páginas |
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Página vii
... variations not super- vening at an early age , and being inherited at a correspond- ing age - RUDIMENTARY ORGANS ; their origin explained - Sum- mary . Page 202 CHAPTER XV . RECAPITULATION AND CONCLUSION . Recapitulation of the ...
... variations not super- vening at an early age , and being inherited at a correspond- ing age - RUDIMENTARY ORGANS ; their origin explained - Sum- mary . Page 202 CHAPTER XV . RECAPITULATION AND CONCLUSION . Recapitulation of the ...
Página 20
... variation , spontaneously appeared in cer- tain individuals of one variety when crossed with those of another variety . For it would clearly be advantage- ous to two varieties or incipient species , if they could be kept from blending ...
... variation , spontaneously appeared in cer- tain individuals of one variety when crossed with those of another variety . For it would clearly be advantage- ous to two varieties or incipient species , if they could be kept from blending ...
Página 57
... variations or individual differences of the right nature , by which some of the inhabitants might be better fitted to their new places under the altered circumstances , would not always occur at once . Unfortunately we have no means of ...
... variations or individual differences of the right nature , by which some of the inhabitants might be better fitted to their new places under the altered circumstances , would not always occur at once . Unfortunately we have no means of ...
Página 75
... variation , but the geological record would then be less perfect . It may be doubted whether the duration of any one great period of subsidence over the whole or part of the archipelago , together with a contemporaneous accumu- lation ...
... variation , but the geological record would then be less perfect . It may be doubted whether the duration of any one great period of subsidence over the whole or part of the archipelago , together with a contemporaneous accumu- lation ...
Página 89
... variation and natural selection . New species have appeared very slowly , one after another , both on the land and in the waters . Lyell has shown that it is hardly possible to resist the evidence on this head in the case of the several ...
... variation and natural selection . New species have appeared very slowly , one after another , both on the land and in the waters . Lyell has shown that it is hardly possible to resist the evidence on this head in the case of the several ...
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Términos y frases comunes
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