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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41 페이지
... important parts of structure , which he could collect on good authority , as I have collected , during a course of years . It should be remembered that systema- tists are far from being pleased at finding variability in important ...
... important parts of structure , which he could collect on good authority , as I have collected , during a course of years . It should be remembered that systema- tists are far from being pleased at finding variability in important ...
181 페이지
... important air - breathing apparatus would have been the same ; for why should this one apparatus , given for the same purpose , have been made to differ , while all the other important organs were closely similar , or rather , identical ...
... important air - breathing apparatus would have been the same ; for why should this one apparatus , given for the same purpose , have been made to differ , while all the other important organs were closely similar , or rather , identical ...
433 페이지
... importance , and of almost universal preva- Ience , and yet leave us in no doubt where it should be ranked . Hence , also , it has been found that a classification founded on any single character , however important that may be , has ...
... importance , and of almost universal preva- Ience , and yet leave us in no doubt where it should be ranked . Hence , also , it has been found that a classification founded on any single character , however important that may be , has ...
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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