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 33
... distinct forms which is fertile . Hence the case appears at first sight exactly the reverse of what occurs , in the ordinary unions of the individuals of the same species and with crosses between distinct species . It is , however ...
... distinct forms which is fertile . Hence the case appears at first sight exactly the reverse of what occurs , in the ordinary unions of the individuals of the same species and with crosses between distinct species . It is , however ...
Página 73
... distinct . This could be effected by the future geologist only by his discovering in a fossil state numerous ... distinct from each other . If the extreme forms in the genus happen to have been thus destroyed , the genus itself will ...
... distinct . This could be effected by the future geologist only by his discovering in a fossil state numerous ... distinct from each other . If the extreme forms in the genus happen to have been thus destroyed , the genus itself will ...
Página 132
... distinct marine faunas . Although so few marine animals are common to the above - named three approximate faunas of Eastern and Western America and the eastern Pacific islands , yet many fishes range from the Pacific into the Indian ...
... distinct marine faunas . Although so few marine animals are common to the above - named three approximate faunas of Eastern and Western America and the eastern Pacific islands , yet many fishes range from the Pacific into the Indian ...
Contenido
CONTENTS OF VOL | 1 |
CHAPTER X | 48 |
CHAPTER XII | 129 |
Derechos de autor | |
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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