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 - 538페이지 |
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230 페이지
... seems more probable that they have passed through this stage , as during the early stages of the trans- formation , the other parts of the cell , with the included zooid , could hardly have disappeared at once . In many cases the ...
... seems more probable that they have passed through this stage , as during the early stages of the trans- formation , the other parts of the cell , with the included zooid , could hardly have disappeared at once . In many cases the ...
266 페이지
... seems at first subversive of the foregoing theory ; namely , that the cells on the extreme margin of wasp - combs are sometimes strictly hexagonal ; but I have not space here to enter on this subject . Nor does there seem to me any ...
... seems at first subversive of the foregoing theory ; namely , that the cells on the extreme margin of wasp - combs are sometimes strictly hexagonal ; but I have not space here to enter on this subject . Nor does there seem to me any ...
489 페이지
... seem to have produced some direct and definite effect , but how much we cannot say . Thus , when varieties enter any ... seems to have played an important part , so that when one part has been modified other parts have been necessarially ...
... seem to have produced some direct and definite effect , but how much we cannot say . Thus , when varieties enter any ... seems to have played an important part , so that when one part has been modified other parts have been necessarially ...
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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