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 83
... effects of close interbreeding , no doubt come into play in many of these cases ; but I will not here en- large on ... effect on the insects must have been still greater , for six insectivorous birds were Struggle for Existence / 83.
... effects of close interbreeding , no doubt come into play in many of these cases ; but I will not here en- large on ... effect on the insects must have been still greater , for six insectivorous birds were Struggle for Existence / 83.
Página 140
... effects of long - continued use or disuse , for we know not the parent - forms ; but many animals possess structures which can be best explained by the effects of disuse . As Professor Owen has remarked , there is no greater anomaly in ...
... effects of long - continued use or disuse , for we know not the parent - forms ; but many animals possess structures which can be best explained by the effects of disuse . As Professor Owen has remarked , there is no greater anomaly in ...
Página 226
... effects of the increased and beneficial use of any part . How much to attribute in each particular case to the effects of use , and how much to natural selection , it seems impossible to decide . I may give another instance of a ...
... effects of the increased and beneficial use of any part . How much to attribute in each particular case to the effects of use , and how much to natural selection , it seems impossible to decide . I may give another instance of a ...
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