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 36
... domestic varieties mani- fested a strong tendency to reversion , —that is , to lose their acquired characters , whilst kept under the same conditions , and whilst kept in a considerable body , so that free intercrossing might check , by ...
... domestic varieties mani- fested a strong tendency to reversion , —that is , to lose their acquired characters , whilst kept under the same conditions , and whilst kept in a considerable body , so that free intercrossing might check , by ...
Página 146
... domestic animals from several wild stocks ; the blood , for instance , of a tropical and arctic wolf may perhaps be mingled in our domestic breeds . The rat and the mouse cannot be considered as domestic animals , but they have been ...
... domestic animals from several wild stocks ; the blood , for instance , of a tropical and arctic wolf may perhaps be mingled in our domestic breeds . The rat and the mouse cannot be considered as domestic animals , but they have been ...
Página 503
... domestic pro- ductions , 33 . Coryanthes , 190 . Creation , single centres of , 368 . Crinum , 279 . Croll , Mr. , on subaerial denudation , 312 . on the age of our oldest forma- tions , 331 . - , on alternate Glacial periods in the ...
... domestic pro- ductions , 33 . Coryanthes , 190 . Creation , single centres of , 368 . Crinum , 279 . Croll , Mr. , on subaerial denudation , 312 . on the age of our oldest forma- tions , 331 . - , on alternate Glacial periods in the ...
Contenido
An Historical Sketch | 15 |
Introduction | 25 |
Variation Under Nature | 58 |
Derechos de autor | |
Otras 13 secciones no mostradas
Otras ediciones - Ver todas
The Origin of Species by Means of Natural Selection: Or, The ..., Volumen2 Charles Darwin Vista de fragmentos - 1972 |
The Origin of Species by Means of Natural Selection: Or, The Preservation of ... Charles Darwin Vista de fragmentos - 1963 |
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