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 107
... intervals between existing genera , families , and orders , is certainly true ; but as this statement has often been ignored or even denied , it may be well to make some remarks on this subject , and to give some instances . If we ...
... intervals between existing genera , families , and orders , is certainly true ; but as this statement has often been ignored or even denied , it may be well to make some remarks on this subject , and to give some instances . If we ...
Página 287
... intervals ; and the amount of change , after equal intervals of time , is widely different in dif- ferent groups . The extinction of species and of whole groups of species , which has played so conspicuous a part in the history of the ...
... intervals ; and the amount of change , after equal intervals of time , is widely different in dif- ferent groups . The extinction of species and of whole groups of species , which has played so conspicuous a part in the history of the ...
Página 303
... intervals . The accumulation of each great fossiliferous formation will be recognised as having depended on an unusual concurrence of favourable cir- cumstances , and the blank intervals between the suc- cessive stages as having been of ...
... intervals . The accumulation of each great fossiliferous formation will be recognised as having depended on an unusual concurrence of favourable cir- cumstances , and the blank intervals between the suc- cessive stages as having been of ...
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