The Origin of Species by Means of Natural Selection: Or, The Preservation of Favored Races in the Struggle for Life, Volumen1AMS Press, 1972 - 479 páginas This is a reproduction of the original artefact. Generally these books are created from careful scans of the original. This allows us to preserve the book accurately and present it in the way the author intended. Since the original versions are generally quite old, there may occasionally be certain imperfections within these reproductions. We're happy to make these classics available again for future generations to enjoy! |
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Página 23
... crossing of a few aboriginal species ; but by crossing we can only get forms in some degree intermediate between their ... crossed one with another for several generations , hardly two of them are alike , and then the difficulty of the ...
... crossing of a few aboriginal species ; but by crossing we can only get forms in some degree intermediate between their ... crossed one with another for several generations , hardly two of them are alike , and then the difficulty of the ...
Página 29
... crossed by the rock - pigeon : I say within a dozen or twenty generations , for no instance is known of crossed descendants reverting to an ancestor of foreign blood removed by a greater number of generations . breed which has been crossed ...
... crossed by the rock - pigeon : I say within a dozen or twenty generations , for no instance is known of crossed descendants reverting to an ancestor of foreign blood removed by a greater number of generations . breed which has been crossed ...
Página 114
... crossed ; and the act of crossing , as can be fully proved , gives rise to vigorous seedlings , which consequently would have the best chance of flourishing and surviving . The plants which produced flowers with the largest glands or ...
... crossed ; and the act of crossing , as can be fully proved , gives rise to vigorous seedlings , which consequently would have the best chance of flourishing and surviving . The plants which produced flowers with the largest glands or ...
Contenido
CHAPTER I | 5 |
VARIATION UNDER NATURE | 51 |
Its bearing on natural selectionThe term used in a wide sense | 75 |
Derechos de autor | |
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The Origin of Species by Means of Natural Selection: Or, the Preservation of ... Charles Darwin Sin vista previa disponible - 2016 |
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The Origin of Species by Means of Natural Selection: Or the Preservation of ... Charles Darwin Sin vista previa disponible - 2018 |
Términos y frases comunes
acquired 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 developed difficulty distinct species disuse 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 improved increase in number individual differences inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ large number larger genera larvæ less likewise males manner Melipona Mivart natural selection naturalists nearly nest occasionally offspring organisation organs origin Origin of Species perfect period pigeons pollen pollen-grains present preserved principle probably produced progenitor quadrupeds rank Red Grouse relation remarked resemble rock-pigeon seeds sexes sexual sexual selection slight stamens striped structure struggle supposed swimbladder tend tendency tion transitional tree variability variations varieties vary widely wings young