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 23
... eggs produced from various crosses between three species of Gallus and their hybrids ; the majority of these eggs had been fertilised ; and in the majority of the fertilised eggs , the embryos had either been partially developed and ...
... eggs produced from various crosses between three species of Gallus and their hybrids ; the majority of these eggs had been fertilised ; and in the majority of the fertilised eggs , the embryos had either been partially developed and ...
Página 24
... eggs only twelve chickens were reared . With plants , hybridised embryos probably often perish in a like manner ; at least it is known that hybrids raised from very distinct species are sometimes weak and dwarfed , and perish at an ...
... eggs only twelve chickens were reared . With plants , hybridised embryos probably often perish in a like manner ; at least it is known that hybrids raised from very distinct species are sometimes weak and dwarfed , and perish at an ...
Página 314
... eggs of other insects . IMAGO . The perfect ( generally winged ) reproductive state of an insect . - INDIGENS . The ... egg , when it is usually in the form of a grub , caterpillar , or maggot . LARYNX . - The upper part of the windpipe ...
... eggs of other insects . IMAGO . The perfect ( generally winged ) reproductive state of an insect . - INDIGENS . The ... egg , when it is usually in the form of a grub , caterpillar , or maggot . LARYNX . - The upper part of the windpipe ...
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