The Origin of Species, Том 2Books, Incorporated, 1900 - Всего страниц: 365 |
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Стр. 309
... genera between living genera , even between genera belonging to distinct families . The most common case , especially with respect to very distinct groups , such as fish and reptiles , seems to be that , supposing them to be ...
... genera between living genera , even between genera belonging to distinct families . The most common case , especially with respect to very distinct groups , such as fish and reptiles , seems to be that , supposing them to be ...
Стр. 318
... genera , each with the same number of species , then we may conclude that generally only one species of each of the older genera has left modified descend- ants , which constitute the new genera containing the several species ; the ...
... genera , each with the same number of species , then we may conclude that generally only one species of each of the older genera has left modified descend- ants , which constitute the new genera containing the several species ; the ...
Стр. 372
... genera on the left hand have , on this same principle , much in common , and form a sub - family distinct from that containing the next two genera on the right hand , which diverged from a common parent at the fifth stage of descent ...
... genera on the left hand have , on this same principle , much in common , and form a sub - family distinct from that containing the next two genera on the right hand , which diverged from a common parent at the fifth stage of descent ...
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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