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 68
... period . It is not , for instance , probable that sediment was deposited during the whole of the glacial period near the mouth of the Mississippi , within that limit of depth at which marine animals can best flourish : for we know that ...
... period . It is not , for instance , probable that sediment was deposited during the whole of the glacial period near the mouth of the Mississippi , within that limit of depth at which marine animals can best flourish : for we know that ...
Página 155
... Glacial period , the arctic productions were as uniform round the polar regions as they are at the present day . But it is also necessary to assume that many sub - arctic and some few temperate forms were the same round ... GLACIAL PERIOD .
... Glacial period , the arctic productions were as uniform round the polar regions as they are at the present day . But it is also necessary to assume that many sub - arctic and some few temperate forms were the same round ... GLACIAL PERIOD .
Página 160
... period having been in a geological sense recent in both hemispheres - from its having lasted in both during a great length of time , as be inferred from the amount of work effected- may and lastly from ... GLACIAL PERIODS [ CHAP . XIL.
... period having been in a geological sense recent in both hemispheres - from its having lasted in both during a great length of time , as be inferred from the amount of work effected- may and lastly from ... GLACIAL PERIODS [ CHAP . XIL.
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