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 29
... stamens , the other a short pistil with long stamens ; the two having differently sized pollen - grains . With trimorphic plants there are three forms likewise differing in the lengths of their pistils and stamens , in the size and ...
... stamens , the other a short pistil with long stamens ; the two having differently sized pollen - grains . With trimorphic plants there are three forms likewise differing in the lengths of their pistils and stamens , in the size and ...
Página 30
... stamens not corresponding in height with the pistil , differs much in degree , up to absolute and utter sterility ; just in the same manner as occurs in crossing distinct species . As the degree of sterility in the latter case depends ...
... stamens not corresponding in height with the pistil , differs much in degree , up to absolute and utter sterility ; just in the same manner as occurs in crossing distinct species . As the degree of sterility in the latter case depends ...
Página 31
... stamens of the short - styled form , and yielded many seeds ; but the latter form did not yield a single seed when fertilised by the longer stamens of the mid- styled form . · In all these respects , and in others which might be added ...
... stamens of the short - styled form , and yielded many seeds ; but the latter form did not yield a single seed when fertilised by the longer stamens of the mid- styled form . · In all these respects , and in others which might be added ...
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