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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53 페이지
... genus have been formed , the species of that genus present a number of varieties , that is , of incipient species , beyond the average . It is not that all large genera are now varying much , and are thus increasing in the number of ...
... genus have been formed , the species of that genus present a number of varieties , that is , of incipient species , beyond the average . It is not that all large genera are now varying much , and are thus increasing in the number of ...
113 페이지
... genus . Their modified descendants , four- teen in number at the fourteen - thousandth generation , will probably ... genus or a distinct genus . The six descendants from ( I ) will form two sub - genera or genera . But as the original ...
... genus . Their modified descendants , four- teen in number at the fourteen - thousandth generation , will probably ... genus or a distinct genus . The six descendants from ( I ) will form two sub - genera or genera . But as the original ...
433 페이지
... genus , but the genus gives the character ; for this seems founded on the appreciation of many trifling points of resemblance , too slight to be defined . Certain plants , belonging to the Malpighiaceæ , bear perfect and degraded ...
... genus , but the genus gives the character ; for this seems founded on the appreciation of many trifling points of resemblance , too slight to be defined . Certain plants , belonging to the Malpighiaceæ , bear perfect and degraded ...
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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