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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... tion in a perfect condition , yet when intercrossed they produce either few or no offspring . Hybrids , on the other hand , have their reproductive organs functionally impotent , as may be clearly seen in the state of the male element ...
... tion in a perfect condition , yet when intercrossed they produce either few or no offspring . Hybrids , on the other hand , have their reproductive organs functionally impotent , as may be clearly seen in the state of the male element ...
Página 325
... tion , ii . 240 . Chthamalinæ , ii . 59 . Chthamalus , cretacean species of , ii . 81 . Circumstances favourable to selec- tion of domestic products , i . 46 -to natural selection , i . 124 . Cirripedes capable of crossing , i . 124 ...
... tion , ii . 240 . Chthamalinæ , ii . 59 . Chthamalus , cretacean species of , ii . 81 . Circumstances favourable to selec- tion of domestic products , i . 46 -to natural selection , i . 124 . Cirripedes capable of crossing , i . 124 ...
Página 331
... tion , ii . 53 . Jussieu , on classification , ii . 209 . K. Kentucky , caves of , i . 172 . Kerguelen - land , flora of , ii . 169 , 189 . Kidney - bean , acclimatisation of , i . 177 . Kidneys of birds , i . 178 . Kirby , on tarsi ...
... tion , ii . 53 . Jussieu , on classification , ii . 209 . K. Kentucky , caves of , i . 172 . Kerguelen - land , flora of , ii . 169 , 189 . Kidney - bean , acclimatisation of , i . 177 . Kidneys of birds , i . 178 . Kirby , on tarsi ...
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