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
... common to very large groups of beetles , but in the Engidæ , as West- wood has 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 ...
... common to very large groups of beetles , but in the Engidæ , as West- wood has 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 ...
181 페이지
... common to inheritance from a common progenitor . Fritz Müller , in order to test the conclusions arrived at in this volume , has followed out with much care a nearly similar line of argument . Several families of crustaceans include a ...
... common to inheritance from a common progenitor . Fritz Müller , in order to test the conclusions arrived at in this volume , has followed out with much care a nearly similar line of argument . Several families of crustaceans include a ...
218 페이지
... common duck . In this latter species the lamellæ are much coarsel than in the shoveller , and are firmly attached to the sides of the mandible ; they are only about fifty in number of each side , and do not project at all beneath the ...
... common duck . In this latter species the lamellæ are much coarsel than in the shoveller , and are firmly attached to the sides of the mandible ; they are only about fifty in number of each side , and do not project at all beneath the ...
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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