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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9 페이지
... slight peculiarities which distinguish the individuals of the same species , and which cannot be accounted for by inheritance from either parent or from some more remote ancestor . Even strongly - marked differences occasionally appear ...
... slight peculiarities which distinguish the individuals of the same species , and which cannot be accounted for by inheritance from either parent or from some more remote ancestor . Even strongly - marked differences occasionally appear ...
44 페이지
... slight degree in an unusual manner , or a pouter till he saw a pigeon with a crop of some- what unusual size ; and ... slight , in one's own possession . Nor must the value which would formerly have been set on any slight differences in ...
... slight degree in an unusual manner , or a pouter till he saw a pigeon with a crop of some- what unusual size ; and ... slight , in one's own possession . Nor must the value which would formerly have been set on any slight differences in ...
274 페이지
... slight deviations in them could not have been governed or accumulated through this latter agency . It is a strange result which we thus arrive at , namely that characters of slight vital importance to the species , are the most ...
... slight deviations in them could not have been governed or accumulated through this latter agency . It is a strange result which we thus arrive at , namely that characters of slight vital importance to the species , are the most ...
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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