The Origin of Species by Means of Natural Selection: Or, the Preservation of Favored Races in the Struggle for Life, 1권Hurst, 1890 - 501페이지 |
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124 페이지
... seen that it is the common , the widely diffused and widely ranging species , belonging to the larger genera within each class , which vary most ; and these tend to transmit to their modified offspring that superiority which now makes ...
... seen that it is the common , the widely diffused and widely ranging species , belonging to the larger genera within each class , which vary most ; and these tend to transmit to their modified offspring that superiority which now makes ...
152 페이지
... seen in duns , and I have seen a trace in a bay horse . My son made a careful examination and sketch for me of a dun Belgian cart - horse with a double stripe on each shoulder and with leg - stripes . I have myself seen a dun Devon ...
... seen in duns , and I have seen a trace in a bay horse . My son made a careful examination and sketch for me of a dun Belgian cart - horse with a double stripe on each shoulder and with leg - stripes . I have myself seen a dun Devon ...
195 페이지
... seen that species at any one period are not indefinitely variable , and are not linked together by a multitude of intermediate gradations , partly because the process of natural selection is always very slow , and at any one time acts ...
... seen that species at any one period are not indefinitely variable , and are not linked together by a multitude of intermediate gradations , partly because the process of natural selection is always very slow , and at any one time acts ...
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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