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 5
... doubt the correctness of this conclusion . Hybrids are seldom raised by experimentalists in great numbers ; and as the parent - species , or other allied hybrids , generally grow in the same garden , the visits of insects must be ...
... doubt the correctness of this conclusion . Hybrids are seldom raised by experimentalists in great numbers ; and as the parent - species , or other allied hybrids , generally grow in the same garden , the visits of insects must be ...
Página 173
... doubt will be discovered -throw some light on this subject . When ducks suddenly emerge from a pond covered with duck - weed , I have twice seen these little plants adhering to their backs ; and it has happened to me , in removing a ...
... doubt will be discovered -throw some light on this subject . When ducks suddenly emerge from a pond covered with duck - weed , I have twice seen these little plants adhering to their backs ; and it has happened to me , in removing a ...
Página 300
... doubt it is possible , as Mr. G. H. Lewes has urged , that at the first commencement of life many different forms were evolved ; but if so , we may conclude that only a very few have left modified descendants . For , as I have recently ...
... doubt it is possible , as Mr. G. H. Lewes has urged , that at the first commencement of life many different forms were evolved ; but if so , we may conclude that only a very few have left modified descendants . For , as I have recently ...
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