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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113 페이지
... nearly related from having recently branched off from a10 ; 614 and f1 , from hav- ing diverged at an earlier period from a5 , will be in some degree distinct from the three first - named species ; and lastly , o1 , e1 and m1 , will be ...
... nearly related from having recently branched off from a10 ; 614 and f1 , from hav- ing diverged at an earlier period from a5 , will be in some degree distinct from the three first - named species ; and lastly , o1 , e1 and m1 , will be ...
260 페이지
... nearly so great as at first . appears : all this beautiful work can be shown , I think , to follow from a few simple ... nearly related to the latter ; it forms a nearly regular waxen comb of cylindrical cells , in which the young are ...
... nearly so great as at first . appears : all this beautiful work can be shown , I think , to follow from a few simple ... nearly related to the latter ; it forms a nearly regular waxen comb of cylindrical cells , in which the young are ...
447 페이지
... nearly all Mar- supials , from having partially retained the character of their common progenitor , or of some early member of the group . On the other hand , of all Marsupials , as Mr. Waterhouse has remarked , the Phascolomys ...
... nearly all Mar- supials , from having partially retained the character of their common progenitor , or of some early member of the group . On the other hand , of all Marsupials , as Mr. Waterhouse has remarked , the Phascolomys ...
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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