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 57
... sometimes the one first described , as the species , and the other as the variety . But cases of great difficulty , which I will not here enumerate , sometimes arise in deciding whether or not to rank one form as a variety of another ...
... sometimes the one first described , as the species , and the other as the variety . But cases of great difficulty , which I will not here enumerate , sometimes arise in deciding whether or not to rank one form as a variety of another ...
Página 200
... sometimes double and sometimes treble , is common ; the side of the face , moreover , is sometimes striped . The stripes are often plainest in the foal ; and some- times quite disappear in old horses . Colonel Poole has seen both gray ...
... sometimes double and sometimes treble , is common ; the side of the face , moreover , is sometimes striped . The stripes are often plainest in the foal ; and some- times quite disappear in old horses . Colonel Poole has seen both gray ...
Página 204
... sometimes they cause direct and definite effects ; and these may become strongly marked in the course of time , though we have not sufficient evidence on this head . Habit in producing constitutional peculiarities and use in ...
... sometimes they cause direct and definite effects ; and these may become strongly marked in the course of time , though we have not sufficient evidence on this head . Habit in producing constitutional peculiarities and use in ...
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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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