The Origin of Species by Means of Natural Selection: Or, the Preservation of Favored Races in the Struggle for Life, 1권Hurst, 1890 - 501페이지 |
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43 페이지
... closely similar to other forms , or are so closely linked to them by intermediate gradations , that naturalists do not like to rank them as distinct species , are in several respects the most important for us . We have every reason ...
... closely similar to other forms , or are so closely linked to them by intermediate gradations , that naturalists do not like to rank them as distinct species , are in several respects the most important for us . We have every reason ...
55 페이지
... closely allied to other species , and in so far resemble varieties , often have much restricted ranges . For instance , Mr. H. C. Watson has marked for me in the well - sifted London catalogue of Plants ( 4th edition ) sixty - three ...
... closely allied to other species , and in so far resemble varieties , often have much restricted ranges . For instance , Mr. H. C. Watson has marked for me in the well - sifted London catalogue of Plants ( 4th edition ) sixty - three ...
443 페이지
... closely imitates an Ithomia , there are sometimes other Lepidoptera mimicking the same Ithomia : so that in the same place , species of three genera of butter- flies and even a moth are found all closely resembling a butterfly belonging ...
... closely imitates an Ithomia , there are sometimes other Lepidoptera mimicking the same Ithomia : so that in the same place , species of three genera of butter- flies and even a moth are found all closely resembling a butterfly belonging ...
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adapted admit affinities allied species America ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied color continued crossed crustaceans degree developed difficulty distinct species domestic doubt effects eggs embryo existing extinct extremely facts favorable females fertility flowers formation forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hybrids hybrids produced important individuals inhabitants inherited insects instance instincts intercrossing intermediate intervals kind lamellæ larvæ less living male mammals manner marsupials migration modified descendants natural selection naturalists nearly nest oceanic islands offspring organs parent peculiar perfect pigeons pistil pollen present principle probably produced quadrupeds ranked remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive suppose tend theory tion trees variability variations varieties vary whole widely different wings young