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 |
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... tion paid to their breeding ; for recently in certain parts of Spain and of the United States this animal has been sur- prisingly modified and improved by careful selection ; in peacocks , from not being very easily reared and a large ...
... tion paid to their breeding ; for recently in certain parts of Spain and of the United States this animal has been sur- prisingly modified and improved by careful selection ; in peacocks , from not being very easily reared and a large ...
89 페이지
... tion of the deepest valleys or the formation of long lines of inland cliffs . Natural selection acts only by the preserva- tion and accumulation of small inherited modifications , each profitable to the preserved being ; and as modern ...
... tion of the deepest valleys or the formation of long lines of inland cliffs . Natural selection acts only by the preserva- tion and accumulation of small inherited modifications , each profitable to the preserved being ; and as modern ...
167 페이지
... tion , so as to have given them a decided advantage over other animals in the battle for life . Hence the chance of discovering species with transitional grades of structure in a fossil condition will always be less , from their having ...
... tion , so as to have given them a decided advantage over other animals in the battle for life . Hence the chance of discovering species with transitional grades of structure in a fossil condition will always be less , from their having ...
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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 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