On the Origin of Species by Means of Natural Selection: Or The Preservation of Favored Races in the Struggle for Life, Volumen2D. Appleton, 1888 - 458 páginas |
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Página viii
... 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 main- land - 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 main- land - On ...
Página xx
... 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'espéce , 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'espéce , nous conduisent ...
Página 13
... continued previous period of less advanced civilisation , 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 tools ...
... continued previous period of less advanced civilisation , 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 tools ...
Página 19
... 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 pro- bably 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 pro- bably quite correct , if applied to species closely related to ...
Página 21
... 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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Términos y frases comunes
adapted admit affinities allied species America analogous ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied colour continued crossed crustaceans degree developed difficulty distinct species doubt effects eggs embryo existing extinct extremely facts favourable fertilised fertility flowers formation formerly forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number habits Hence hybrids 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 occasionally occur oceanic islands offspring organisation organs parent peculiar perfect pigeon pistil pollen present preserved principle probably produced quadrupeds ranked reciprocal crosses remarked reproductive resemblance rudimentary seeds sexual selection slight South America stamens sterility structure struggle successive supposed tend theory tion variability variations varieties vary whilst whole wings young