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 119
... present time both groups are greatly reduced , whilst others , intermediate in organisation , have largely increased ; consequently some naturalists maintain that molluscs were formerly more highly developed than at present ; but a ...
... present time both groups are greatly reduced , whilst others , intermediate in organisation , have largely increased ; consequently some naturalists maintain that molluscs were formerly more highly developed than at present ; but a ...
Página 122
... present character of the southern half of the con- tinent ; and the southern half was formerly more closely allied , than it is at present , to the northern half . In a similar manner we know , from Falconer and Cautley's discoveries ...
... present character of the southern half of the con- tinent ; and the southern half was formerly more closely allied , than it is at present , to the northern half . In a similar manner we know , from Falconer and Cautley's discoveries ...
Página 155
... present day . But it is also necessary to assume that many sub - arctic and some few temperate forms were the same round the world , for some of the species which now exist on the lower mountain - slopes and on the plains of North ...
... present day . But it is also necessary to assume that many sub - arctic and some few temperate forms were the same round the world , for some of the species which now exist on the lower mountain - slopes and on the plains of North ...
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