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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... widely different jaws ; or lastly , and this is the greatest difficulty , one set of workers of one size and structure , and simultaneously another set of workers of a different size and structure ; a graduated series having first been ...
... widely different jaws ; or lastly , and this is the greatest difficulty , one set of workers of one size and structure , and simultaneously another set of workers of a different size and structure ; a graduated series having first been ...
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... widely different milk dentition . Any one may of course deny that the teeth in either case have been adapted for tearing flesh , through the natural selection of successive variations ; but if this be admitted in the one case , it is ...
... widely different milk dentition . Any one may of course deny that the teeth in either case have been adapted for tearing flesh , through the natural selection of successive variations ; but if this be admitted in the one case , it is ...
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... widely different animals . We see the same great law in the construction of the mouths of insects : what can be more different than the immensely long spiral proboscis of a sphinx - moth , the curious folded one of a bee or bug , and ...
... widely different animals . We see the same great law in the construction of the mouths of insects : what can be more different than the immensely long spiral proboscis of a sphinx - moth , the curious folded one of a bee or bug , and ...
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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