The Origin of Species by Means of Natural Selection: Or, The Preservation of Favored Races in the Struggle for Life, Volumen2AMS Press, 1972 |
Dentro del libro
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Página 32
... whilst other and more sterile hybrids produce few flowers , and are weak , miserable dwarfs ; exactly similar cases occur with the illegitimate offspring of various dimorphic and trimorphic plants . Altogether there is the closest ...
... whilst other and more sterile hybrids produce few flowers , and are weak , miserable dwarfs ; exactly similar cases occur with the illegitimate offspring of various dimorphic and trimorphic plants . Altogether there is the closest ...
Página 223
... whilst others are undoubtedly distinct species . But why , it may be asked , are certain forms treated as the mimicked and others as the mimickers ? Mr. Bates satisfactorily answers this question , by showing that the form which is ...
... whilst others are undoubtedly distinct species . But why , it may be asked , are certain forms treated as the mimicked and others as the mimickers ? Mr. Bates satisfactorily answers this question , by showing that the form which is ...
Página 270
... whilst the domestic pig or dog will breed freely under the most diversified conditions , will at the same time be able to give a definite answer to the question why two distinct species , when crossed , as well as their hybrid offspring ...
... whilst the domestic pig or dog will breed freely under the most diversified conditions , will at the same time be able to give a definite answer to the question why two distinct species , when crossed , as well as their hybrid offspring ...
Contenido
CONTENTS OF VOL | 1 |
CHAPTER X | 48 |
CHAPTER XII | 129 |
Derechos de autor | |
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Otras ediciones - Ver todas
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