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 - 458페이지 |
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27 페이지
... principle of selection as that which enables the agriculturist , not only to modify the character of his flock , but to change it altogether . It is the magician's wand , by means of which he may summon into life whatever form and mold ...
... principle of selection as that which enables the agriculturist , not only to modify the character of his flock , but to change it altogether . It is the magician's wand , by means of which he may summon into life whatever form and mold ...
29 페이지
... principle is a modern discovery . I could give several references to works of high antiquity , in which the full importance of the principle is acknowledged . In rude and barbarous periods of English history choice ani- mals were often ...
... principle is a modern discovery . I could give several references to works of high antiquity , in which the full importance of the principle is acknowledged . In rude and barbarous periods of English history choice ani- mals were often ...
123 페이지
... principle of inheritance , these will tend to produce offspring similarly characterized . This principle of preservation , or the survival of the fit- test , I have called natural selection . It leads to the im provement of each ...
... principle of inheritance , these will tend to produce offspring similarly characterized . This principle of preservation , or the survival of the fit- test , I have called natural selection . It leads to the im provement of each ...
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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