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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... complex and sometimes varying conditions of life , will have a better chance of surviving , and thus be naturally selected . From the strong principle of inheritance , any selected variety will tend to propagate its new and modified ...
... complex and sometimes varying conditions of life , will have a better chance of surviving , and thus be naturally selected . From the strong principle of inheritance , any selected variety will tend to propagate its new and modified ...
202 페이지
... complex folds of enamel in the teeth of many animals , and a multi- tude of analogous cases . With respect to plants , this sub- ject has been discussed by Nägeli in an admirable essay . He admits that natural selection has effected ...
... complex folds of enamel in the teeth of many animals , and a multi- tude of analogous cases . With respect to plants , this sub- ject has been discussed by Nägeli in an admirable essay . He admits that natural selection has effected ...
244 페이지
... complex and wonderful instincts have originated . As modifications of corporeal structure arise from , and are increased by , use or habit , and are diminished or lost by disuse , so I do not doubt it has been with instincts . I believe ...
... complex and wonderful instincts have originated . As modifications of corporeal structure arise from , and are increased by , use or habit , and are diminished or lost by disuse , so I do not doubt it has been with instincts . I believe ...
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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