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 96
... greater difficulty in this being effected through natural selection , than in the cotton - planter increasing and improving by selection the down in the pods on his cotton - trees . Natural selection may modify and adapt the larva of an ...
... greater difficulty in this being effected through natural selection , than in the cotton - planter increasing and improving by selection the down in the pods on his cotton - trees . Natural selection may modify and adapt the larva of an ...
Página 118
... greater number of plants and a greater weight of dry herbage can be raised in the latter than in the former case . The same has been found to hold good when one variety and several mixed varieties of wheat have been sown on equal spaces ...
... greater number of plants and a greater weight of dry herbage can be raised in the latter than in the former case . The same has been found to hold good when one variety and several mixed varieties of wheat have been sown on equal spaces ...
Página 171
... greater chance of being exterminated than one existing in large numbers ; and in this particular case the intermediate form would be eminently liable to the inroads of closely - allied forms existing on both sides of it . But it is a ...
... greater chance of being exterminated than one existing in large numbers ; and in this particular case the intermediate form would be eminently liable to the inroads of closely - allied forms existing on both sides of it . But it is a ...
Contenido
An Historical Sketch | 15 |
Introduction | 25 |
Variation Under Nature | 58 |
Derechos de autor | |
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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