The Origin of Species, Том 2Books, Incorporated, 1900 - Всего страниц: 365 |
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Стр. 243
... individuals , and in other species all the individuals , can actually be hybridized much more readily than they can be fertilized by pollen from the same individual plant ! To give one instance , a bulb of Hippeas- trum aulicum ...
... individuals , and in other species all the individuals , can actually be hybridized much more readily than they can be fertilized by pollen from the same individual plant ! To give one instance , a bulb of Hippeas- trum aulicum ...
Стр. 252
... individual animal not belonging to a social community , if rendered slightly sterile when crossed with some other variety , would not thus itself gain any advantage or indirectly give any advantage to the other individuals of the same ...
... individual animal not belonging to a social community , if rendered slightly sterile when crossed with some other variety , would not thus itself gain any advantage or indirectly give any advantage to the other individuals of the same ...
Стр. 330
... individuals of the same form will be de- scended from a single parent . But in the great majority of cases , namely , with all organisms which habitually unite for each birth , or which occasionally intercross , the individuals of the ...
... individuals of the same form will be de- scended from a single parent . But in the great majority of cases , namely , with all organisms which habitually unite for each birth , or which occasionally intercross , the individuals of the ...
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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