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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99 페이지
... inhabitants will have been numerous in individu- als and kinds , and will have been subjected to severe com- petition . When converted by subsistance into large separate islands there will still have existed many indi- viduals of the ...
... inhabitants will have been numerous in individu- als and kinds , and will have been subjected to severe com- petition . When converted by subsistance into large separate islands there will still have existed many indi- viduals of the ...
390 페이지
... inhabitants of the north , these would take the places of the former inhabitants of the temperate regions . The latter , at the same time , would travel further and further southward , unless they were stopped by barriers , in which ...
... inhabitants of the north , these would take the places of the former inhabitants of the temperate regions . The latter , at the same time , would travel further and further southward , unless they were stopped by barriers , in which ...
418 페이지
... inhabitants ! The inhabitants of the Cape Verde Islands are related to those of Africa , like those of the Galapagos to America . Facts , such as these , admit of no sort of explanation on the ordinary view of in- dependent creation ...
... inhabitants ! The inhabitants of the Cape Verde Islands are related to those of Africa , like those of the Galapagos to America . Facts , such as these , admit of no sort of explanation on the ordinary view of in- dependent creation ...
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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