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 140
... climate , might have been a high road for migration , when the climate was different . I shall , however , presently have to discuss this branch of the subject in some detail . Changes of level in the land must also have been highly ...
... climate , might have been a high road for migration , when the climate was different . I shall , however , presently have to discuss this branch of the subject in some detail . Changes of level in the land must also have been highly ...
Página 152
... climate . The ruins of a house burnt by fire de not tell their tale more plainly than do the mountains of Scotland and Wales , with their scored flanks , polished surfaces , and perched boulders , of the icy streams with which their ...
... climate . The ruins of a house burnt by fire de not tell their tale more plainly than do the mountains of Scotland and Wales , with their scored flanks , polished surfaces , and perched boulders , of the icy streams with which their ...
Página 155
... climate before the commencement of the Glacial period . At this , the newer Pliocene period , the majority of the inhabitants of the world were specifi- cally the same as now , and we have good reason to be- lieve that the climate was ...
... climate before the commencement of the Glacial period . At this , the newer Pliocene period , the majority of the inhabitants of the world were specifi- cally the same as now , and we have good reason to be- lieve that the climate was ...
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