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 23
... developed , as seems to have been the case with some of Thuret's experiments on Fuci . No explanation can be given of these facts , any more than why certain trees cannot be grafted on others . Lastly , an embryo may be developed , and ...
... developed , as seems to have been the case with some of Thuret's experiments on Fuci . No explanation can be given of these facts , any more than why certain trees cannot be grafted on others . Lastly , an embryo may be developed , and ...
Página 240
... developed into mature males and females , propagating their kind in the ordinary manner by eggs . It may be worth notice that when Wagner's remark- able discovery was first announced , I was asked how was it possible to account for the ...
... developed into mature males and females , propagating their kind in the ordinary manner by eggs . It may be worth notice that when Wagner's remark- able discovery was first announced , I was asked how was it possible to account for the ...
Página 257
... developed , unless we have reason to suppose that they were formerly more highly developed , ought not to be con- sidered as rudimentary . They may be in a nascent condition , and in progress towards further development . Rudimentary ...
... developed , unless we have reason to suppose that they were formerly more highly developed , ought not to be con- sidered as rudimentary . They may be in a nascent condition , and in progress towards further development . Rudimentary ...
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 - 1963 |
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