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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147 페이지
... remarked , the number varies greatly and the number likewise differs in the two sexes of the same species . Again in the fossorial hymenoptera , the neura- tion of the wings is a character of the highest importance , because common to ...
... remarked , the number varies greatly and the number likewise differs in the two sexes of the same species . Again in the fossorial hymenoptera , the neura- tion of the wings is a character of the highest importance , because common to ...
453 페이지
... remarked , the benefit derived from the yielding of the separate pieces in the act of par- turition by mammals , will by no means explain the same construction in the skulls of birds and reptiles . Why should similar bones have been ...
... remarked , the benefit derived from the yielding of the separate pieces in the act of par- turition by mammals , will by no means explain the same construction in the skulls of birds and reptiles . Why should similar bones have been ...
500 페이지
... remarked , " the spores and other reproduc- tive bodies of many of the lower alge may claim to have first a characteristically animal , and then an unequivocally vegetable existence . ' Therefore , on the principle of natural selection ...
... remarked , " the spores and other reproduc- tive bodies of many of the lower alge may claim to have first a characteristically animal , and then an unequivocally vegetable existence . ' Therefore , on the principle of natural selection ...
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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