The Origin of Species by Means of Natural Selection,: Or the Preservation of Favoured Races in the Struggle for LifeJohn Murray, Albemarle Street., 1891 - 432페이지 |
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viii 페이지
... Continued . Distribution of fresh - water productions - On the inhabitants of oceanic islands -Absence of Batrachians and of terrestrial Mammals - On the relation of the inhabitants of islands to those of the nearest mainland - On ...
... Continued . Distribution of fresh - water productions - On the inhabitants of oceanic islands -Absence of Batrachians and of terrestrial Mammals - On the relation of the inhabitants of islands to those of the nearest mainland - On ...
xx 페이지
... continued reproduction . " A well - known French botanist , M. Lecoq , writes in 1854 ( ' Etudes sur Géograph . Bot . , ' tom . i . p . 250 ) , " On voit que nos recherches sur la fixité ou la variation de l'espèce , nous conduisent ...
... continued reproduction . " A well - known French botanist , M. Lecoq , writes in 1854 ( ' Etudes sur Géograph . Bot . , ' tom . i . p . 250 ) , " On voit que nos recherches sur la fixité ou la variation de l'espèce , nous conduisent ...
13 페이지
... continued previous period of less advanced civilisa- tion , during which the domesticated animals , kept by different tribes in different districts , might have varied and given rise to distinct races . Since the discovery of flint ...
... continued previous period of less advanced civilisa- tion , during which the domesticated animals , kept by different tribes in different districts , might have varied and given rise to distinct races . Since the discovery of flint ...
18 페이지
... continued domestication eliminates this strong tendency to sterility in species . From the history of the dog , and of some other domestic animals , this conclusion is probably quite correct , if applied to species closely related to ...
... continued domestication eliminates this strong tendency to sterility in species . From the history of the dog , and of some other domestic animals , this conclusion is probably quite correct , if applied to species closely related to ...
20 페이지
... continued study they are strongly impressed with the differences between the several races ; and though they well know that each race varies slightly , for they win their prizes by selecting such slight differences , yet they ignore all ...
... continued study they are strongly impressed with the differences between the several races ; and though they well know that each race varies slightly , for they win their prizes by selecting such slight differences , yet they ignore all ...
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accumulated adapted admit affinities allied species America analogous ancient appear beak become bees believe belonging birds breeds cause cells characters climate closely allied colour continued crossed crustaceans degree developed difficulty distinct species domestic animals doubt effects eggs embryo existing extinct extremely facts favourable female fertilised fertility flowers formation formerly forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number habits Hence hybrids important increase 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 occasionally occur oceanic islands offspring organisation organs parent peculiar perfect pigeon pistil pollen present preserved principle probably produced quadrupeds ranked reciprocal crosses remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive supposed tend theory tion variability variations varieties vary whilst whole wings young