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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235 페이지
... organs appear at first to offer another and far more serious difficulty ; for they occur in about a dozen kinds of fish , of which several are widely remote in their affinities . When the same organ is found in several members of the ...
... organs appear at first to offer another and far more serious difficulty ; for they occur in about a dozen kinds of fish , of which several are widely remote in their affinities . When the same organ is found in several members of the ...
257 페이지
... organ or lung . Many similar instances could be given . Useful organs , however little they may be developed , unless we have reason to suppose that they were for- merly more highly developed , ought not to be consid- ered as ...
... organ or lung . Many similar instances could be given . Useful organs , however little they may be developed , unless we have reason to suppose that they were for- merly more highly developed , ought not to be consid- ered as ...
292 페이지
... organs when rendered useless under changed habits or conditions of life ; and we can under- stand on this view the meaning of rudimentary organs . But disuse and selection will generally act on each crea- ture , when it has come to ...
... organs when rendered useless under changed habits or conditions of life ; and we can under- stand on this view the meaning of rudimentary organs . But disuse and selection will generally act on each crea- ture , when it has come to ...
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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