The Origin of Species by Means of Natural Selection, Or, The Preservation of Favored Races in the Struggle for Life: Reprinted from the Sixth London Edition, with All Additions and CorrectionsA. L. Burt Company, 1890 - 458페이지 |
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118 페이지
... suppose that new and simple forms are continu- ally being produced by spontaneous generation . Science has not as yet proved the truth of this belief , whatever the future may reveal . On our theory the continued existence of lowly ...
... suppose that new and simple forms are continu- ally being produced by spontaneous generation . Science has not as yet proved the truth of this belief , whatever the future may reveal . On our theory the continued existence of lowly ...
262 페이지
... suppose the Melipona to arrange her cells in level layers , as she already does her cylindrical cells ; and we must further suppose , and this is the greatest difficulty , that she can somehow judge accurately at what distance to stand ...
... suppose the Melipona to arrange her cells in level layers , as she already does her cylindrical cells ; and we must further suppose , and this is the greatest difficulty , that she can somehow judge accurately at what distance to stand ...
447 페이지
... suppose either that all Rodents , including the bizcacha , branched off from some ancient Marsupial , which will naturally have been more or less intermediate in character with respect to all existing Mursupials ; or that both Rodents ...
... suppose either that all Rodents , including the bizcacha , branched off from some ancient Marsupial , which will naturally have been more or less intermediate in character with respect to all existing Mursupials ; or that both Rodents ...
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adapted admit affinities ALEXANDRE DUMAS allied species America ancient appear 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 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 paleozoic parent peculiar perfect pigeons pistil pollen present principle probably produced quadrupeds ranked remarked resemblance rudimentary seeds Silurian SIR WALTER SCOTT slight South America stamens sterility structure successive suppose tend theory tion trees variability variations varieties vary whole widely different wings young