The Origin of Species by Means of Natural Selection, Or, The Preservation of Favored Races in the Struggle for Life, 1-2권D. Appleton, 1917 |
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... period when the several species branched off from the com- mon progenitor of the genus . This period will sel- dom be remote in any extreme degree , as species rarely endure for more than one geological period . An ex- traordinary ...
... period when the several species branched off from the com- mon progenitor of the genus . This period will sel- dom be remote in any extreme degree , as species rarely endure for more than one geological period . An ex- traordinary ...
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... period . It is not , for instance , probable that sediment was de- posited during the whole of the glacial period near the mouth of the Mississippi , within that limit of depth at which marine animals can best flourish : for we know ...
... period . It is not , for instance , probable that sediment was de- posited during the whole of the glacial period near the mouth of the Mississippi , within that limit of depth at which marine animals can best flourish : for we know ...
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... period farther north under the Polar Circle , in latitude 66 ° -67 ° ; and that the present arctic productions then lived on the broken land still nearer to the pole . Now , if we look at a terrestrial globe , we see under the Polar ...
... period farther north under the Polar Circle , in latitude 66 ° -67 ° ; and that the present arctic productions then lived on the broken land still nearer to the pole . Now , if we look at a terrestrial globe , we see under the Polar ...
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adapted affinity allied species ancient animals appear Archipelago beak become believe belonging birds breeds Cambrian cause characters climate closely allied colour common continent crossed crustaceans degree developed difficulty distinct species domestic doubt eggs embryo Europe existing extinct extremely facts favourable fertilised fertility fish flowers formation formerly forms fossil Fritz Müller Gärtner genera genus geological geological period Glacial period gradations groups of species habits Hence hybrids hybrids produced important individuals inhabitants inherited insects instance instincts intercrossing intermediate land larvæ less living male mammals manner Marsupials migration modified descendants natural selection naturalists nearly occur oceanic islands offspring organisation parent peculiar perfect pigeon pistil plants pollen present probably produced progenitor quadrupeds ranked reciprocal crosses remarked resemblance seeds Silurian slight South America stage stamens sterility structure successive suppose theory tion variability variations varieties vary whilst whole widely different wings