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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... reason why one tree will not take on another , from differences in their rate of growth , in the hardness of their wood , in the period of the flow or nature of their sap , & c .; but in a multitude of cases we can assign no reason ...
... reason why one tree will not take on another , from differences in their rate of growth , in the hardness of their wood , in the period of the flow or nature of their sap , & c .; but in a multitude of cases we can assign no reason ...
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... reason to believe that organisms high in the scale , change more quickly than those that are low : though there are exceptions to this rule . The amount of or- ganic change , as Pictet has remarked , is not the same in each successive ...
... reason to believe that organisms high in the scale , change more quickly than those that are low : though there are exceptions to this rule . The amount of or- ganic change , as Pictet has remarked , is not the same in each successive ...
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... reason to believe that a modification , which has already been inherited for many generations , may continue to be inherited for an almost infinite number of generations . On the other hand , we have evidence that variability . when it ...
... reason to believe that a modification , which has already been inherited for many generations , may continue to be inherited for an almost infinite number of generations . On the other hand , we have evidence that variability . when it ...
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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