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 95
... species and whole groups of species last for very unequal periods ; some groups , as we have seen , have endured from the earliest known dawn of life to the present day ; some have disappeared before the close of the paleozoic period ...
... species and whole groups of species last for very unequal periods ; some groups , as we have seen , have endured from the earliest known dawn of life to the present day ; some have disappeared before the close of the paleozoic period ...
Página 109
... species , being considered as intermediate between any two living species , or groups of species . If by this term it is meant that an extinct form is directly intermediate in all its characters between two living forms or groups , the ...
... species , being considered as intermediate between any two living species , or groups of species . If by this term it is meant that an extinct form is directly intermediate in all its characters between two living forms or groups , the ...
Página 126
... species belonging to large and dominant groups tend to leave many modified descendants , which form new sub - groups and groups . As these are formed , the species of the less vigorous groups , from their in- feriority inherited from a ...
... species belonging to large and dominant groups tend to leave many modified descendants , which form new sub - groups and groups . As these are formed , the species of the less vigorous groups , from their in- feriority inherited from a ...
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