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 83
... probably differed greatly from any known animal . Some of the most ancient animals , as the Nautilus , Lingula , & c . , do not differ much from living species ; and it cannot on our theory be supposed , that these old species were the ...
... probably differed greatly from any known animal . Some of the most ancient animals , as the Nautilus , Lingula , & c . , do not differ much from living species ; and it cannot on our theory be supposed , that these old species were the ...
Página 274
... probably varieties ; but who will pretend that in future ages so many fossil links will be discovered , that naturalists will be able to decide whether or not these doubtful forms ought to be called varieties ? Only a small portion of ...
... probably varieties ; but who will pretend that in future ages so many fossil links will be discovered , that naturalists will be able to decide whether or not these doubtful forms ought to be called varieties ? Only a small portion of ...
Página 275
... probably been shorter than the average duration of specific forms . Successive formations are in most cases separated from each other by blank intervals of time of great length ; for fossiliferous formations thick enough to resist ...
... probably been shorter than the average duration of specific forms . Successive formations are in most cases separated from each other by blank intervals of time of great length ; for fossiliferous formations thick enough to resist ...
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