The Origin of Species by Means of Natural Selection: Or the Preservation of Favored Races in the Struggle for LifeD. Appleton, 1904 - 435페이지 |
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xx 페이지
... islands , he chiefly expresses that he knows not how the Red Grouse came to be there , and there exclusively ; signifying also , by this mode of expressing such ignorance , his belief that both the bird and the islands owed their origin ...
... islands , he chiefly expresses that he knows not how the Red Grouse came to be there , and there exclusively ; signifying also , by this mode of expressing such ignorance , his belief that both the bird and the islands owed their origin ...
55 페이지
... intermediate gra- dations , it is probable that they were once thus con- nected . Mr. Wallace , for instance , describes a certain . butterfly which presents in the same island a great range 6 CHAP . II . ] 55 INDIVIDUAL DIFFERENCES .
... intermediate gra- dations , it is probable that they were once thus con- nected . Mr. Wallace , for instance , describes a certain . butterfly which presents in the same island a great range 6 CHAP . II . ] 55 INDIVIDUAL DIFFERENCES .
56 페이지
... island a great range of varieties connected by intermediate links , and the extreme links of the chain closely resemble the two forms of an allied dimorphic species inhabiting an- other part of the Malay archipelago . Thus also with ...
... island a great range of varieties connected by intermediate links , and the extreme links of the chain closely resemble the two forms of an allied dimorphic species inhabiting an- other part of the Malay archipelago . Thus also with ...
58 페이지
... island . The local forms are moderately constant and distinct in each separate island ; but when all from the several islands are compared together , the differences are seen to be so slight and graduated , that it is impossible to ...
... island . The local forms are moderately constant and distinct in each separate island ; but when all from the several islands are compared together , the differences are seen to be so slight and graduated , that it is impossible to ...
59 페이지
... island as do the local forms and sub - species ; but as they are distin- guished from each other by a greater amount of ... islands of the Galapagos archipelago , one with another , and with those from the American mainland , I was much ...
... island as do the local forms and sub - species ; but as they are distin- guished from each other by a greater amount of ... islands of the Galapagos archipelago , one with another , and with those from the American mainland , I was much ...
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adapted affinities allied species America ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied colour common continent crossed crustaceans degree developed difficulty distinct species domestic doubt effects eggs embryo existing extinct extremely facts favourable fertilised fertility flowers formation forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hybrids important individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ larvæ less living males mammals manner marsupials migration modified descendants natural selection naturalists nearly nest occasionally offspring organisation organs parent peculiar perfect pigeon pistil pollen present principle probably produced progenitor quadrupeds ranked remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive supposed swimbladder tend theory tion trees variability variations varieties vary whilst whole wings young