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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... flower , as from the anthers of the flower itself which is to be fertilised ; so that a cross between two flowers , though probably often on the same plant , would be thus effected . Moreover , when- ever complicated experiments are in ...
... flower , as from the anthers of the flower itself which is to be fertilised ; so that a cross between two flowers , though probably often on the same plant , would be thus effected . Moreover , when- ever complicated experiments are in ...
Página 285
... flower be more likely to vary in any one species of a genus , if the other species possess differently coloured flowers , than if all possessed the same coloured flowers ? If species are only well - marked varieties , of which the ...
... flower be more likely to vary in any one species of a genus , if the other species possess differently coloured flowers , than if all possessed the same coloured flowers ? If species are only well - marked varieties , of which the ...
Página 318
... ( flowers ) .- Flowers having many stamens . POLYGAMOUS PLANTS . - Plants in which some flowers are unisexual and others hermaphrodite . The unisexual ( male and female ) flowers , may be on the same or on different plants . POLYMORPHIC ...
... ( flowers ) .- Flowers having many stamens . POLYGAMOUS PLANTS . - Plants in which some flowers are unisexual and others hermaphrodite . The unisexual ( male and female ) flowers , may be on the same or on different plants . POLYMORPHIC ...
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