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 47
... rarely possess more than one breed of the same species . Pigeons can be mated for life , and this is a great convenience to the fancier , for thus many races may be improved and kept true , though mingled in the same aviary ; and this ...
... rarely possess more than one breed of the same species . Pigeons can be mated for life , and this is a great convenience to the fancier , for thus many races may be improved and kept true , though mingled in the same aviary ; and this ...
Página 308
... rarely from the light , -in opposition to , and more rarely in the direction of , the attraction of gravity . When the nerves and muscles of an animal are excited by galvanism or by the absorption of strychnine , the consequent ...
... rarely from the light , -in opposition to , and more rarely in the direction of , the attraction of gravity . When the nerves and muscles of an animal are excited by galvanism or by the absorption of strychnine , the consequent ...
Página 328
... rarely or never become " broody , " that is , never wish to sit on their eggs . Familiarity alone prevents our seeing how largely and how permanently the minds of our domestic animals have been modified . It is scarcely possible to ...
... rarely or never become " broody , " that is , never wish to sit on their eggs . Familiarity alone prevents our seeing how largely and how permanently the minds of our domestic animals have been modified . It is scarcely possible to ...
Contenido
CHAPTER I | 5 |
VARIATION UNDER NATURE | 51 |
Its bearing on natural selectionThe term used in a wide sense | 75 |
Derechos de autor | |
Otras 5 secciones no mostradas
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