The Origin of Species, Том 2Books, Incorporated, 1900 - Всего страниц: 365 |
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Стр. 239
... Sterility Various in Degree , not Universal , affected by Close Interbreeding , re- moved by Domestication - Laws governing the Sterility of Hybrids― Sterility not a Special Endowment , but Incidental on Other Differences , not ...
... Sterility Various in Degree , not Universal , affected by Close Interbreeding , re- moved by Domestication - Laws governing the Sterility of Hybrids― Sterility not a Special Endowment , but Incidental on Other Differences , not ...
Стр. 240
... sterility of species ; for it seems to make a broad and clear distinction between varieties and species . DEGREES OF STERILITY First , for the sterility of species when crossed and of their hy- brid offspring . It is impossible to study ...
... sterility of species ; for it seems to make a broad and clear distinction between varieties and species . DEGREES OF STERILITY First , for the sterility of species when crossed and of their hy- brid offspring . It is impossible to study ...
Стр. 267
... sterility does not strictly follow systematic affinity , but is governed by several curious and com- plex laws . It is generally different , and sometimes widely differ- ent , in reciprocal crosses between the same two species . It is ...
... sterility does not strictly follow systematic affinity , but is governed by several curious and com- plex laws . It is generally different , and sometimes widely differ- ent , in reciprocal crosses between the same two species . It is ...
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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