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 37
... separated sexes , they never naturally crossed . He then fertilised thirteen flowers of the one kind with pollen of the other ; but only a single head produced any seed , and this one head produced only five grains . Manipulation in ...
... separated sexes , they never naturally crossed . He then fertilised thirteen flowers of the one kind with pollen of the other ; but only a single head produced any seed , and this one head produced only five grains . Manipulation in ...
Página 109
... separated by a some- what lesser number of characters ; so that the two groups formerly made a somewhat nearer approach to each other than they now do . It is a common belief that the more ancient a form is , by so much the more it ...
... separated by a some- what lesser number of characters ; so that the two groups formerly made a somewhat nearer approach to each other than they now do . It is a common belief that the more ancient a form is , by so much the more it ...
Página 155
... separated from each other by the whole Atlantic Ocean and by the northern part of the Pacific . During the Glacial period , when the inhabitants of the Old and New Worlds lived farther southwards than they do at present , they must have ...
... separated from each other by the whole Atlantic Ocean and by the northern part of the Pacific . During the Glacial period , when the inhabitants of the Old and New Worlds lived farther southwards than they do at present , they must have ...
Contenido
CONTENTS OF VOL | 1 |
CHAPTER X | 48 |
CHAPTER XII | 129 |
Derechos de autor | |
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The Origin of Species by Means of Natural Selection: Or, The Preservation of ... Charles Darwin Vista de fragmentos - 1962 |
The Origin of Species by Means of Natural Selection: Or, The Preservation of ... Charles Darwin Vista de fragmentos - 1962 |
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