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 186
... organs , and as we know nothing about the habits and structure of the progenitors of the existing electric fishes , it would be extremely bold to maintain that no service- able transitions are possible by which these organs might have ...
... organs , and as we know nothing about the habits and structure of the progenitors of the existing electric fishes , it would be extremely bold to maintain that no service- able transitions are possible by which these organs might have ...
Página 202
... organs show what wonderful changes in function are at least possible . For instance , a swim- bladder has apparently been converted into an air - breathing lung . The same organ having performed simultaneously very different functions ...
... organs show what wonderful changes in function are at least possible . For instance , a swim- bladder has apparently been converted into an air - breathing lung . The same organ having performed simultaneously very different functions ...
Página 417
... organs to mistake a merely adaptive for an essential character . " With plants how remarkable it is that the organs of vegetation , on which their nutrition and life depend , are of little signifi- cance ; whereas the organs of ...
... organs to mistake a merely adaptive for an essential character . " With plants how remarkable it is that the organs of vegetation , on which their nutrition and life depend , are of little signifi- cance ; whereas the organs of ...
Contenido
An Historical Sketch | 15 |
Introduction | 25 |
Variation Under Nature | 58 |
Derechos de autor | |
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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