The Origin of Species by Means of Natural Selection, Or, The Preservation of Favored Races in the Struggle for Life: Reprinted from the Sixth London Edition, with All Additions and CorrectionsA. L. Burt Company, 1890 - 538페이지 |
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6 페이지
... Variability - Effects of Habit and the use or disuse of Parts - Correlated Variation -- Inheritance - Character of Domes- tic Varieties — Difficulty of distinguishing between Varieties and Species - Origin of Domestic Varieties from one ...
... Variability - Effects of Habit and the use or disuse of Parts - Correlated Variation -- Inheritance - Character of Domes- tic Varieties — Difficulty of distinguishing between Varieties and Species - Origin of Domestic Varieties from one ...
37 페이지
... variability , both by acting directly on the organization , and indirectly by affecting the reproductive system . It is not probable that variability is an inherent and necessary contingent , under all circum- stances . The greater or ...
... variability , both by acting directly on the organization , and indirectly by affecting the reproductive system . It is not probable that variability is an inherent and necessary contingent , under all circum- stances . The greater or ...
144 페이지
... variability in the parts undergoing modi- fication may always be expected . Now let us turn to nature . When a part ... variability , which has continually been accumulated by natural selection for the benefit of the species . But as the ...
... variability in the parts undergoing modi- fication may always be expected . Now let us turn to nature . When a part ... variability , which has continually been accumulated by natural selection for the benefit of the species . But as the ...
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adapted admit affinities ALEXANDRE DUMAS allied species America ancient appear 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 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 paleozoic parent peculiar perfect pigeons pistil pollen present principle probably produced quadrupeds ranked remarked resemblance rudimentary seeds Silurian SIR WALTER SCOTT slight South America stamens sterility structure successive suppose tend theory tion trees variability variations varieties vary whole widely different wings young