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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55 페이지
... allied to other species , and in so far resemble varieties , often have much restricted ranges . For instance , Mr. H. C. Watson has marked for me in the well - sifted London catalogue of Plants ( 4th edition ) sixty - three plants ...
... allied to other species , and in so far resemble varieties , often have much restricted ranges . For instance , Mr. H. C. Watson has marked for me in the well - sifted London catalogue of Plants ( 4th edition ) sixty - three plants ...
368 페이지
... allied , than it is at present , to the northern half . In a similar manner we know , from Fal- coner and Cautley's discoveries , that Northern India was formerly more closely related in its mammals to Africa than it is at the present ...
... allied , than it is at present , to the northern half . In a similar manner we know , from Fal- coner and Cautley's discoveries , that Northern India was formerly more closely related in its mammals to Africa than it is at the present ...
435 페이지
... allied to others , and these to others , and so onward , can be recognized as unequivocally belonging to this , and to no other class of the Articulata . Geographical distribution has often been used , though perhaps not quite logically ...
... allied to others , and these to others , and so onward , can be recognized as unequivocally belonging to this , and to no other class of the Articulata . Geographical distribution has often been used , though perhaps not quite logically ...
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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