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 6
... fertilised hybrids , in contrast with those spontaneously self- fertilised , may , as I believe , be accounted for by too close interbreeding having been avoided . Now let us turn to the results arrived at by a third most experienced ...
... fertilised hybrids , in contrast with those spontaneously self- fertilised , may , as I believe , be accounted for by too close interbreeding having been avoided . Now let us turn to the results arrived at by a third most experienced ...
Página 7
... fertilised by pollen from the same individual plant ! To give one instance , a bulb of Hippeastrum aulicum produced four flowers ; three were fertilised by Herbert with their own pollen , and the fourth was subsequently fertilised by ...
... fertilised by pollen from the same individual plant ! To give one instance , a bulb of Hippeastrum aulicum produced four flowers ; three were fertilised by Herbert with their own pollen , and the fourth was subsequently fertilised by ...
Página 31
... fertilised by the longer stamens of the mid- styled form . · In all these respects , and in others which might be added , the forms of the same undoubted species when illegitimately united behave in exactly the same manner as do two ...
... fertilised by the longer stamens of the mid- styled form . · In all these respects , and in others which might be added , the forms of the same undoubted species when illegitimately united behave in exactly the same manner as do two ...
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