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 67
... migration due to climatal and other changes ; and when we see a species first appearing in any formation , the probability is that it only then first immigrated into that area . It is well - known , for instance , that several species ...
... migration due to climatal and other changes ; and when we see a species first appearing in any formation , the probability is that it only then first immigrated into that area . It is well - known , for instance , that several species ...
Página 138
... migrated , undergoing modification during their migration , from some one area . If , when most of the species inhabiting one region are different from those of another region , though closely allied to them , it can be shown that migration ...
... migrated , undergoing modification during their migration , from some one area . If , when most of the species inhabiting one region are different from those of another region , though closely allied to them , it can be shown that migration ...
Página 169
... migration cannot be indicated . We cannot say why certain species and not others have migrated ; why certain species have been modified and have given rise to new forms , whilst others have remained unaltered . We cannot hope to explain ...
... migration cannot be indicated . We cannot say why certain species and not others have migrated ; why certain species have been modified and have given rise to new forms , whilst others have remained unaltered . We cannot hope to explain ...
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