The Origin of Species, Том 2Books, Incorporated, 1900 - Всего страниц: 365 |
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Стр. 261
... become perfectly fertile together . With plants , so far is cultivation from giving a tendency toward sterility between distinct species , that in several well - authenticated cases already alluded to , certain plants have been affected ...
... become perfectly fertile together . With plants , so far is cultivation from giving a tendency toward sterility between distinct species , that in several well - authenticated cases already alluded to , certain plants have been affected ...
Стр. 298
... become in some degree modified and improved , would be liable to extermination . Hence , we see why all the species in the same region do at last , if we look to long enough intervals of time , become modified , for otherwise they would ...
... become in some degree modified and improved , would be liable to extermination . Hence , we see why all the species in the same region do at last , if we look to long enough intervals of time , become modified , for otherwise they would ...
Стр. 301
... becoming less and less favor- able , we assuredly should not have perceived the fact , yet the fos- sil horse would certainly have become rarer and rarer , and finally extinct - its place being seized on by some more successful com ...
... becoming less and less favor- able , we assuredly should not have perceived the fact , yet the fos- sil horse would certainly have become rarer and rarer , and finally extinct - its place being seized on by some more successful com ...
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Часто встречающиеся слова и выражения
adapted admit affinity ancient animals appear Archipelago areas become believe belonging birds Cambrian characters classification climate closely allied species common continent creation crustaceans degree deposits descent with modification developed difficulty distant distinct species domestic doubt embryo Europe existing extinct facts faunas 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 INDIANENSIS individuals inhabitants inherited insects instance intermediate intervals land larvæ less living mammæ mammals manner marine Marsupials MDCCCXX migration modified descendants mongrels mountains natural selection naturalists nearly oceanic islands offspring parent peculiar perfect pistil plants pollen present probably produced progenitor quadrupeds reciprocal crosses regions remains remarked reproductive resemblance rocks rudimentary organs seeds SIGILLUM Silurian South America stage stamens sterility structure successive suppose terrestrial tertiary theory of natural tion variations varieties VERITAS whole widely different