The Origin of Species by Means of Natural Selection; Or, the Preservation of Favored Races in the Struggle for Life ...A.L. Burt, 1890 - 538페이지 |
도서 본문에서
91개의 결과 중 1 - 3개
79 페이지
... structure of the adult . So , con- versely , modifications in the adult may affect the structure of the larva ; but in all cases natural selection will insure that they shall not be injurious : for if they were so , the species would ...
... structure of the adult . So , con- versely , modifications in the adult may affect the structure of the larva ; but in all cases natural selection will insure that they shall not be injurious : for if they were so , the species would ...
136 페이지
... structure ; but that the effects have often been largely combined with , and sometimes overmastered by , the natural ... structure arising in the young or larvæ naturally tend to affect the structure of the mature animal . The several ...
... structure ; but that the effects have often been largely combined with , and sometimes overmastered by , the natural ... structure arising in the young or larvæ naturally tend to affect the structure of the mature animal . The several ...
167 페이지
... structure in a fossil condition will always be less , from their having existed in lesser numbers , than in the case of species with fully developed structures . I will now give two or three instances , both of diversified and of ...
... structure in a fossil condition will always be less , from their having existed in lesser numbers , than in the case of species with fully developed structures . I will now give two or three instances , both of diversified and of ...
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 gilt top Glacial period gradations greater number groups of species habits Hence hybrids hybrids produced important individuals inhabitants inherited insects instance instincts intercrossing intermediate 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 variability variations varieties vary whole widely different wings young