The Origin of Species by Means of Natural Selection: Or, The Preservation of Favored Races in the Struggle for Life, Volumen2AMS Press, 1972 |
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Página 38
... coloured varieties of the same species yield fewer seeds , in the proportion of 86 to 100 , than the similarly coloured varieties . Yet these varieties differ in no respect except in the colour of their flowers ; and one variety can ...
... coloured varieties of the same species yield fewer seeds , in the proportion of 86 to 100 , than the similarly coloured varieties . Yet these varieties differ in no respect except in the colour of their flowers ; and one variety can ...
Página 335
... coloured animals , i . 13 . similar effect of , on animals and plants , ii . 299 . Pollen of fir - trees , i . 257 ... colour , i . 198 . Rhododendron , sterility of , ii . 7 , 8 . Richard , Prof .. on Aspicarps , ii . 209 . Richardson ...
... coloured animals , i . 13 . similar effect of , on animals and plants , ii . 299 . Pollen of fir - trees , i . 257 ... colour , i . 198 . Rhododendron , sterility of , ii . 7 , 8 . Richard , Prof .. on Aspicarps , ii . 209 . Richardson ...
Página 339
... colour of , i . 247 . Woodward , Mr. , on the duration of specific forms , ii . 66 . on Pyrgoma , ii . 81 . on the continuous succession of genera , ii . 93 . on the succession of types , ii . 121 . World . species changing simultane ...
... colour of , i . 247 . Woodward , Mr. , on the duration of specific forms , ii . 66 . on Pyrgoma , ii . 81 . on the continuous succession of genera , ii . 93 . on the succession of types , ii . 121 . World . species changing simultane ...
Contenido
CONTENTS OF VOL | 1 |
CHAPTER X | 48 |
CHAPTER XII | 129 |
Derechos de autor | |
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Términos y frases comunes
accumulated adapted admit adult affinity allied species ancient animals appear Archipelago arctic areas become beds believe birds breeds Cambrian changes characters classification climate closely allied continent crustaceans degree deposited difficulty distant distinct species domestic doubt embryo Europe existing extinct fact faunas fertilised fertility flowers formations formerly forms fossil fresh-water Fritz Müller Gärtner genera genus geological period geological record Glacial period groups of species habits hybrids hybrids produced important individuals inhabitants inherited insects instance intermediate intervals land larvæ less living mammals manner marine Marsupials migration modified descendants mongrels mountains natural selection naturalists nearly occur oceanic islands offspring organisation parent parent-form peculiar perfect pistil plants pollen present probably produced quadrupeds reciprocal crosses regions remains remarked reproductive resemblance rocks rudimentary organs seeds Silurian slight South America species belonging stage stamens sterility structure successive suppose terrestrial tertiary tion variations varieties whilst widely different wings