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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... offspring . Hybrids , on the other hand , have their reproductive organs functionally impotent , as may be clearly seen in the state of the male element in both plants and animals ; though the formative organs themselves are perfect in ...
... offspring . Hybrids , on the other hand , have their reproductive organs functionally impotent , as may be clearly seen in the state of the male element in both plants and animals ; though the formative organs themselves are perfect in ...
Página 40
... offspring of species , and the so - called mongrel offspring of varieties . And , on the other hand , they agree most closely in many important respects . I shall here discuss this subject with extreme brevity . The most important ...
... offspring of species , and the so - called mongrel offspring of varieties . And , on the other hand , they agree most closely in many important respects . I shall here discuss this subject with extreme brevity . The most important ...
Página 269
... offspring are more or less sterile ; and these forms belong to the same undoubted species , and differ from each other in no respect except in their reproductive organs and functions . Although the fertility of varieties when ...
... offspring are more or less sterile ; and these forms belong to the same undoubted species , and differ from each other in no respect except in their reproductive organs and functions . Although the fertility of varieties when ...
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