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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87 페이지
... various steps , though dimorphism and other means , by which the separation of the sexes in plants of various kinds is apparently now in progress ; but I may add that some of the species of holly in North America are , according to Asa ...
... various steps , though dimorphism and other means , by which the separation of the sexes in plants of various kinds is apparently now in progress ; but I may add that some of the species of holly in North America are , according to Asa ...
354 페이지
... various countries and the nature of their inhabitants . This great fact of the parallel succession of the forms of life throughout the world , is explicable on the theory of natural selection . New species are formed by having some ...
... various countries and the nature of their inhabitants . This great fact of the parallel succession of the forms of life throughout the world , is explicable on the theory of natural selection . New species are formed by having some ...
447 페이지
... various ways and degrees , to all the species ; and they will consequently be related to each other by circuitous lines of affinity of various lengths ( as may be seen in the diagram so often referred to ) , mounting up through many ...
... various ways and degrees , to all the species ; and they will consequently be related to each other by circuitous lines of affinity of various lengths ( as may be seen in the diagram so often referred to ) , mounting up through many ...
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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