The Origin of Species by Means of Natural Selection: Or, the Preservation of Favored Races in the Struggle for Life, Volumen1D. Appleton, 1898 |
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Página 20
... remarked , that they had at this early age progressed considerably in civilisation ; and this again implies a long continued previous period of less advanced civilisation , during which the. 20 CHARACTER OF DOMESTIC VARIETIES . [ CHAP . I.
... remarked , that they had at this early age progressed considerably in civilisation ; and this again implies a long continued previous period of less advanced civilisation , during which the. 20 CHARACTER OF DOMESTIC VARIETIES . [ CHAP . I.
Página 43
... remarked by some authors , have more of the character of true species than the varieties kept in civilised coun- tries . On the view here given of the important part which selection by man has played , it becomes at once obvious , how ...
... remarked by some authors , have more of the character of true species than the varieties kept in civilised coun- tries . On the view here given of the important part which selection by man has played , it becomes at once obvious , how ...
Página 46
... remarked , with respect to the sheep of parts of Yorkshire , " as they generally belong to poor people , and are mostly in small lots , they never can be improved . " On the other hand , nurserymen , from keeping large stocks of the ...
... remarked , with respect to the sheep of parts of Yorkshire , " as they generally belong to poor people , and are mostly in small lots , they never can be improved . " On the other hand , nurserymen , from keeping large stocks of the ...
Página 47
... remarked , that it was most fortunate that the strawberry began to vary just when gardeners began to attend to this plant . No doubt the strawberry had always varied since it was cultivated , but the slightest varieties had been ...
... remarked , that it was most fortunate that the strawberry began to vary just when gardeners began to attend to this plant . No doubt the strawberry had always varied since it was cultivated , but the slightest varieties had been ...
Página 48
... remarked with much truth , a limit will be at last reached . For in- stance , there must be a limit to the fleetness of any terrestrial animal , as this will be determined by the. 48 [ CHAP . I. CIRCUMSTANCES FAVOURABLE .
... remarked with much truth , a limit will be at last reached . For in- stance , there must be a limit to the fleetness of any terrestrial animal , as this will be determined by the. 48 [ CHAP . I. CIRCUMSTANCES FAVOURABLE .
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Términos y frases comunes
adapted advantage allied analogous animals and plants appear Asa Gray beak become bees believe birds breeds caudicle cause cells characters climate closely colour common crossed cuckoo degree descendants developed difficulty distinct species disuse divergence domestic animals domestic races doubt effects eggs existence extinct extremely facts favourable females flowers forms Fritz Müller genera genus giraffe gradations greater number groups habits Hence hermaphrodites hive-bee important increase inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ large number larger genera larvæ less males manner Melipona Mivart modified natural selection naturalists nearly nest occasionally offspring organisation organs origin Origin of Species parent perfect period pigeons pollen pollen-grains present preserved prey principle probably produced progenitor quadrupeds rank rarely Red Grouse relation remarked resemble rock-pigeon seeds sexes sexual selection slight stamens striped structure struggle supposed swimbladder tend tendency tion tree variability variations varieties vary widely wings young