The Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeCollier Books, 1962 - 512 páginas |
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Página 154
... continued selection , are also eminently liable to variation . Look at the individuals of the same breed of the ... continued amount of variability , which has continually been accumulated by natural selection for the benefit of the ...
... continued selection , are also eminently liable to variation . Look at the individuals of the same breed of the ... continued amount of variability , which has continually been accumulated by natural selection for the benefit of the ...
Página 237
... continued preservation of the indi- viduals of some extinct high - reaching ruminant , which had the longest necks , legs , & c . , and could browse a little above the average height , and the continued destruction of those which could ...
... continued preservation of the indi- viduals of some extinct high - reaching ruminant , which had the longest necks , legs , & c . , and could browse a little above the average height , and the continued destruction of those which could ...
Página 249
... continued and com- pulsory habit ; but this is not true . No one would ever have thought of teaching , or probably could have taught , the tum- bler - pigeon to tumble , —an action which , as I have witnessed , is performed by young ...
... continued and com- pulsory habit ; but this is not true . No one would ever have thought of teaching , or probably could have taught , the tum- bler - pigeon to tumble , —an action which , as I have witnessed , is performed by young ...
Contenido
An Historical Sketch | 15 |
Introduction | 25 |
Variation Under Nature | 58 |
Derechos de autor | |
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Términos y frases comunes
accumulated adapted admit affinities allied species America analogous ancient appear beak become bees believe belonging birds breeds cause cells characters climate closely allied colour common continent crossed crustaceans degree developed difficulty distinct species domestic doubt eggs embryo existing extinct extremely facts favourable fertilised fertility flowers formation forms fossil Fritz Müller genera genus geological Glacial period gradations greater number groups of species 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 offspring organisation organs Origin of Species parent peculiar perfect pigeons pistil pollen present principle probably produced progenitor 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