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 29
... less and less , as in each suc- ceeding generation there will be less of the foreign blood ; but when there has been no cross , and there In a is a tendency in the breed to revert to a CHAP . I. ] 29 DOMESTIC PIGEONS .
... less and less , as in each suc- ceeding generation there will be less of the foreign blood ; but when there has been no cross , and there In a is a tendency in the breed to revert to a CHAP . I. ] 29 DOMESTIC PIGEONS .
Página 130
... less severe , and there will have been less modifica- tion and less extermination . Hence , we can understand how it is that the flora of Madeira , according to Oswald Heer , resembles to a certain extent the extinct tertiary flora of ...
... less severe , and there will have been less modifica- tion and less extermination . Hence , we can understand how it is that the flora of Madeira , according to Oswald Heer , resembles to a certain extent the extinct tertiary flora of ...
Página 161
... less improved and intermediate forms of life . On these principles , the nature of the affinities , and the ... less closely and unequally related , forming sections and sub - genera , species of distinct genera much less closely related ...
... less improved and intermediate forms of life . On these principles , the nature of the affinities , and the ... less closely and unequally related , forming sections and sub - genera , species of distinct genera much less closely related ...
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