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 39
... supposed variety , if proved to be infertile in any degree , would almost universally be ranked as a species ; -from man attend- ing only to external characters in his domestic varieties , and from such varieties not having been exposed ...
... supposed variety , if proved to be infertile in any degree , would almost universally be ranked as a species ; -from man attend- ing only to external characters in his domestic varieties , and from such varieties not having been exposed ...
Página 53
... supposed , especially in arid districts , by the wind ; it is then transported by the streams and rivers , which when rapid deepen their channels , and triturate the fragments . On a rainy day , even in a gently undula- ting country ...
... supposed , especially in arid districts , by the wind ; it is then transported by the streams and rivers , which when rapid deepen their channels , and triturate the fragments . On a rainy day , even in a gently undula- ting country ...
Página 111
... supposed to have perished at . different periods , and some to have endured to the present day . By looking at the diagram we can see that if many of the extinct forms supposed to be imbedded in the successive formations , were ...
... supposed to have perished at . different periods , and some to have endured to the present day . By looking at the diagram we can see that if many of the extinct forms supposed to be imbedded in the successive formations , were ...
Contenido
CONTENTS OF VOL | 1 |
CHAPTER X | 48 |
CHAPTER XII | 129 |
Derechos de autor | |
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The Origin of Species by Means of Natural Selection: Or, The Preservation of ... Charles Darwin Vista de fragmentos - 1962 |
The Origin of Species by Means of Natural Selection: Or, The Preservation of ... Charles Darwin Vista de fragmentos - 1963 |
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