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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... various steps , through dimorphism and other means , by which the separation of the sexes in plants of various kinds is ap- parently now in progress ; but I may add that some of the species of holly in North America , are , according to ...
... various steps , through dimorphism and other means , by which the separation of the sexes in plants of various kinds is ap- parently now in progress ; but I may add that some of the species of holly in North America , are , according to ...
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... various degrees of sterility to prevent their crossing and blending in na ture , than to think that trees have been specially en- dowed with various and somewhat analogous degrees of difficulty in being grafted together in order to ...
... various degrees of sterility to prevent their crossing and blending in na ture , than to think that trees have been specially en- dowed with various and somewhat analogous degrees of difficulty in being grafted together in order to ...
214 페이지
... various languages now spoken throughout the world ; and if all extinct languages , and all intermediate and slowly changing dialects , were to be included , such an arrangement would be the only possible one . Yet it might be that some ...
... various languages now spoken throughout the world ; and if all extinct languages , and all intermediate and slowly changing dialects , were to be included , such an arrangement would be the only possible one . Yet it might be that some ...
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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