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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... whole groups of species last for very unequal periods ; some groups , as we have seen , have endured from the earliest known dawn of life to the present day ; some have disappeared before the close of the paleozoic period . No fixed law ...
... whole groups of species last for very unequal periods ; some groups , as we have seen , have endured from the earliest known dawn of life to the present day ; some have disappeared before the close of the paleozoic period . No fixed law ...
125 페이지
... whole chain could be perfectly restored , as a new and distinct species ; for it is not pre- tended that we have any sure criterion by which species and varieties can be discriminated . He who rejects this view of the imperfection of ...
... whole chain could be perfectly restored , as a new and distinct species ; for it is not pre- tended that we have any sure criterion by which species and varieties can be discriminated . He who rejects this view of the imperfection of ...
160 페이지
... whole line of the Cordillera , it at one time appeared to me that we could not avoid the conclusion that the temperature of the whole world had been simultaneously lowered during the Glacial period . But now Mr. Croll , in a series of ...
... whole line of the Cordillera , it at one time appeared to me that we could not avoid the conclusion that the temperature of the whole world had been simultaneously lowered during the Glacial period . But now Mr. Croll , in a series of ...
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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