The Origin of Species by Means of Natural Selection: Or, The Preservation of Favored Races in the Struggle for LifeP.F. Collier & son, 1902 - 356페이지 |
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18 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 ...
78 페이지
... , describes a certain butterfly which presents in the same island a great range of varieties connected by intermediate links , and the ex- treme links of the chain closely resemble the two forms 78 THE ORIGIN OF SPECIES.
... , describes a certain butterfly which presents in the same island a great range of varieties connected by intermediate links , and the ex- treme links of the chain closely resemble the two forms 78 THE ORIGIN OF SPECIES.
81 페이지
... island . The local forms are mod . erately 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 mod . erately 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 ...
82 페이지
... island as do the local forms and sub - species ; but as they are distinguished 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 distinguished 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 ...
83 페이지
... islands . When , on the other hand , an animal or plant ranges over the same continent , or inhabits many islands in the same archipel- ago , and presents different forms in the different areas , there is always a good chance that ...
... islands . When , on the other hand , an animal or plant ranges over the same continent , or inhabits many islands in the same archipel- ago , and presents different forms in the different areas , there is always a good chance that ...
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adapted admit affinities allied species America analogous ancient animals appear beak become bees believe belonging birds breeds cause cells characters climate closely allied color common continent crossed crustaceans degree developed difficulty distinct species domestic doubt eggs embryo existing extinct extremely facts favorable fertility flowers formation forms fossil Fritz Müller genera genus geological 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 male mammals manner marsupial migration modification modified descendants natural selection naturalists nearly nest offspring organs ORIGIN OF SPECIES paleozoic parent peculiar perfect pigeon pistil plants pollen present principle probably produced progenitor quadrupeds ranked reciprocal crosses remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive supposed swimbladder theory tion trees variability variations varieties vary whole wings young