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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188 페이지
... variability in the parts undergoing modification may always be expected . Now let us turn to nature . When a part ... variability , which has continually been accumulated by natural selection for the benefit of the species . But as the ...
... variability in the parts undergoing modification may always be expected . Now let us turn to nature . When a part ... variability , which has continually been accumulated by natural selection for the benefit of the species . But as the ...
193 페이지
... variability of specific characters , or those which distinguish species from species , than of generic characters , or those which are possessed by all the species ; -that the frequent ex- treme variability of any part which is ...
... variability of specific characters , or those which distinguish species from species , than of generic characters , or those which are possessed by all the species ; -that the frequent ex- treme variability of any part which is ...
40 페이지
... variability in the offspring in both cases is notorious ; but some few instances of both hybrids and mongrels long retaining a uniform charac- ter could be given . The variability , however , in the successive generations of mongrels is ...
... variability in the offspring in both cases is notorious ; but some few instances of both hybrids and mongrels long retaining a uniform charac- ter could be given . The variability , however , in the successive generations of mongrels is ...
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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