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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... naturalists have honestly confessed ) which do not vary ; and , under this point of view , no instance will ever be found of an important part varying ; but under any other point of view many instances assuredly can be given . There is ...
... naturalists have honestly confessed ) which do not vary ; and , under this point of view , no instance will ever be found of an important part varying ; but under any other point of view many instances assuredly can be given . There is ...
61 페이지
... naturalists maintain that animals never present varieties ; but then these same naturalists rank the slightest difference as of specific value ; and when the same identical form is met with in two distant countries , or in two ...
... naturalists maintain that animals never present varieties ; but then these same naturalists rank the slightest difference as of specific value ; and when the same identical form is met with in two distant countries , or in two ...
296 페이지
... naturalists , who will be able to view both sides of the question with impartiality . Whoever is led to be- lieve that species are mutable will do good service by conscientiously expressing his conviction ; for thus only can the load of ...
... naturalists , who will be able to view both sides of the question with impartiality . Whoever is led to be- lieve that species are mutable will do good service by conscientiously expressing his conviction ; for thus only can the load 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