The Origin of Species by Means of Natural Selection,: Or the Preservation of Favoured Races in the Struggle for LifeJohn Murray, Albemarle Street., 1891 - 432페이지 |
도서 본문에서
84개의 결과 중 1 - 5개
xiv 페이지
... respect to the means of modification , he attributed something to the direct action of the physical condi- tions of life , something to the crossing of already existing forms , and much to use and disuse , that is , to the effects of ...
... respect to the means of modification , he attributed something to the direct action of the physical condi- tions of life , something to the crossing of already existing forms , and much to use and disuse , that is , to the effects of ...
xx 페이지
... respect , expressed about the year 1859 ( see Prof. Rudolph Wagner , " Zoologisch - Anthropologische Untersuchungen , ' 1861 , s . 51 ) his conviction , chiefly grounded on the laws of geographical distribu- 6 references in Godron's ...
... respect , expressed about the year 1859 ( see Prof. Rudolph Wagner , " Zoologisch - Anthropologische Untersuchungen , ' 1861 , s . 51 ) his conviction , chiefly grounded on the laws of geographical distribu- 6 references in Godron's ...
5 페이지
... respect to the direct action , we must bear in mind that in every case , as Professor Weismann has lately insisted , and as I have incidentally shown in my work on Variation under Domestication , ' there are two factors : namely , the ...
... respect to the direct action , we must bear in mind that in every case , as Professor Weismann has lately insisted , and as I have incidentally shown in my work on Variation under Domestication , ' there are two factors : namely , the ...
6 페이지
... respect to what I have called the indirect action of changed conditions , namely , through the reproductive system of being affected , we may infer that variability is thus induced , partly from the fact of this system being extremely ...
... respect to what I have called the indirect action of changed conditions , namely , through the reproductive system of being affected , we may infer that variability is thus induced , partly from the fact of this system being extremely ...
11 페이지
... respects , they often differ in an extreme degree in some one part , both when compared one with another , and more especially when compared with the species under nature to which they are nearest allied . With these exceptions ( and ...
... respects , they often differ in an extreme degree in some one part , both when compared one with another , and more especially when compared with the species under nature to which they are nearest allied . With these exceptions ( and ...
기타 출판본 - 모두 보기
자주 나오는 단어 및 구문
accumulated adapted admit affinities allied species America analogous ancient appear beak become bees believe belonging birds breeds cause cells characters climate closely allied colour continued crossed crustaceans degree developed difficulty distinct species domestic animals doubt effects eggs embryo existing extinct extremely facts favourable female fertilised fertility flowers formation formerly forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number habits Hence hybrids important increase 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 occasionally occur oceanic islands offspring organisation organs parent peculiar perfect pigeon pistil pollen present preserved principle probably produced quadrupeds ranked reciprocal crosses remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive supposed tend theory tion variability variations varieties vary whilst whole wings young