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 35
... certain South American indigenous do- mestic dogs do not readily unite with European dogs , the explanation which will occur to every one , and probably the true one , is that they are descended from aboriginally distinct species ...
... certain South American indigenous do- mestic dogs do not readily unite with European dogs , the explanation which will occur to every one , and probably the true one , is that they are descended from aboriginally distinct species ...
Página 77
... certain genera or families have not been found beneath a certain stage , that they did not exist before that stage . In all cases positive palæontological evidence may be implicitly trusted ; negative evidence is worthless , as ...
... certain genera or families have not been found beneath a certain stage , that they did not exist before that stage . In all cases positive palæontological evidence may be implicitly trusted ; negative evidence is worthless , as ...
Página 234
... certain bones , lengthened to any extent , with the membrane connecting them increased , so as to serve as a wing ; yet all these modifications would not tend to alter the framework of the bones or the relative connexion of the parts ...
... certain bones , lengthened to any extent , with the membrane connecting them increased , so as to serve as a wing ; yet all these modifications would not tend to alter the framework of the bones or the relative connexion of the parts ...
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