The Origin of Species by Means of Natural Selection: Or, the Preservation of Favored Races in the Struggle for Life, 1권Hurst, 1890 - 501페이지 |
도서 본문에서
54개의 결과 중 1 - 3개
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 ...
306 페이지
... variability graduates away . When mongrels and the more fertile hybrids are propagated for several generations , an extreme amount of variability in the offspring in both cases is notorious ; but some few instances of both hybrids and ...
... variability graduates away . When mongrels and the more fertile hybrids are propagated for several generations , an extreme amount of variability in the offspring in both cases is notorious ; but some few instances of both hybrids and ...
483 페이지
... variability , caused , or at least excited , by changed conditions of life ; but often in so obscure a manner , that we are tempted to consider the varia- tions as spontaneous . Variability is governed by many com- plex laws , by ...
... variability , caused , or at least excited , by changed conditions of life ; but often in so obscure a manner , that we are tempted to consider the varia- tions as spontaneous . Variability is governed by many com- plex laws , by ...
기타 출판본 - 모두 보기
자주 나오는 단어 및 구문
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