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 32
... species by the improper union of certain forms , whilst ordinary hybrids are produced from an improper union between so - called distinct species . We have also already seen that there is the closest similarity in all respects between ...
... species by the improper union of certain forms , whilst ordinary hybrids are produced from an improper union between so - called distinct species . We have also already seen that there is the closest similarity in all respects between ...
Página 33
... distinct species as any in the world ; but he would be completely mistaken . The facts now given on dimorphic and ... species may exist and may differ in no respect whatever , either in structure or in constitution , relatively to ...
... distinct species as any in the world ; but he would be completely mistaken . The facts now given on dimorphic and ... species may exist and may differ in no respect whatever , either in structure or in constitution , relatively to ...
Página 38
... species . Moreover , he asserts that , when yellow and white varieties of one species are crossed with yellow and white varieties of a distinct species , more seed is produced by the crosses between the similarly coloured flowers , than ...
... species . Moreover , he asserts that , when yellow and white varieties of one species are crossed with yellow and white varieties of a distinct species , more seed is produced by the crosses between the similarly coloured flowers , than ...
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