The Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeJ. Murray, 1920 - 432페이지 |
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xvi 페이지
... America , ' published in 1836 , wrote ( p . 6 ) as follows : - " All species might have been varieties once , and many varieties are gradually becoming species by assuming constant and peculiar characters ; " but farther on ( p . 18 ) ...
... America , ' published in 1836 , wrote ( p . 6 ) as follows : - " All species might have been varieties once , and many varieties are gradually becoming species by assuming constant and peculiar characters ; " but farther on ( p . 18 ) ...
1 페이지
... America , and in the geological relations of the present to the past inhabitants of that continent . These facts , as will be seen in the latter chapters of this volume , seemed to throw some light on the origin of species - that ...
... America , and in the geological relations of the present to the past inhabitants of that continent . These facts , as will be seen in the latter chapters of this volume , seemed to throw some light on the origin of species - that ...
34 페이지
... America and Europe , which differ very slightly from each other , have been ranked by one eminent naturalist as undoubted species , and by another as varieties , or , as they are often called , geographical races ! Mr. Wallace , in ...
... America and Europe , which differ very slightly from each other , have been ranked by one eminent naturalist as undoubted species , and by another as varieties , or , as they are often called , geographical races ! Mr. Wallace , in ...
35 페이지
... America and Europe is ample , will that between Europe and the Azores , or Madeira , or the Canaries , or between the several islets of these small archipelagos , be sufficient ? Mr. B. D. Walsh , a distinguished entomologist of the ...
... America and Europe is ample , will that between Europe and the Azores , or Madeira , or the Canaries , or between the several islets of these small archipelagos , be sufficient ? Mr. B. D. Walsh , a distinguished entomologist of the ...
47 페이지
... America , and latterly in Australia , had not been well authenticated , they would have been incredible . So it is with plants ; cases could be given of intro- duced plants which have become common throughout whole islands in a period ...
... America , and latterly in Australia , had not been well authenticated , they would have been incredible . So it is with plants ; cases could be given of intro- duced plants which have become common throughout whole islands in a period ...
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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 fact 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 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