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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... groups which are all trying to increase in number . One large group will slowly conquer another large group , reduce ... groups , from branching out and seizing on many new places in the polity of Nature , will constantly tend to ...
... groups which are all trying to increase in number . One large group will slowly conquer another large group , reduce ... groups , from branching out and seizing on many new places in the polity of Nature , will constantly tend to ...
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... groups of species . If by this term it is meant that an extinct form is di- rectly intermediate in all its characters between two living forms or groups , the objection is probably valid . But in a natural classification many fossil ...
... groups of species . If by this term it is meant that an extinct form is di- rectly intermediate in all its characters between two living forms or groups , the objection is probably valid . But in a natural classification many fossil ...
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... group . Thus , the natural system is genealogical in its arrangement , like a pedigree : but the amount of modification which the different groups have under- gone has to be expressed by ranking them under dif- ferent so - called genera ...
... group . Thus , the natural system is genealogical in its arrangement , like a pedigree : but the amount of modification which the different groups have under- gone has to be expressed by ranking them under dif- ferent so - called genera ...
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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