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 110
... genera , and the dotted lines diverging from them the specics in each genus . The diagram is much too simple , too few genera and too few species being given , but this is unimportant for us . The horizontal lines may represent ...
... genera , and the dotted lines diverging from them the specics in each genus . The diagram is much too simple , too few genera and too few species being given , but this is unimportant for us . The horizontal lines may represent ...
Página 123
... genera each with the same number of species , then we may conclude that generally only one species of each of the older genera has left modified descendants , which constitute the new genera containing the several species ; the other ...
... genera each with the same number of species , then we may conclude that generally only one species of each of the older genera has left modified descendants , which constitute the new genera containing the several species ; the other ...
Página 204
... genera on the right hand , which diverged from a common parent at the fifth stage of descent . These five genera have also much in common , though less than when grouped in sub - families ; and they form a family distinct from that ...
... genera on the right hand , which diverged from a common parent at the fifth stage of descent . These five genera have also much in common , though less than when grouped in sub - families ; and they form a family distinct from that ...
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