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 110
... ancient progenitor . Hence we can understand the rule that the most ancient fossils differ most from existing forms . We must not , however , assume that divergence of character is a necessary contingency ; it depends solely on the ...
... ancient progenitor . Hence we can understand the rule that the most ancient fossils differ most from existing forms . We must not , however , assume that divergence of character is a necessary contingency ; it depends solely on the ...
Página 127
... ancient and recent , make together a few grand classes . We can understand , from the continued ten- dency to divergence of character , why the more ancient a form is , the more it generally differs from those now living ; why ancient ...
... ancient and recent , make together a few grand classes . We can understand , from the continued ten- dency to divergence of character , why the more ancient a form is , the more it generally differs from those now living ; why ancient ...
Página 254
... ancient progenitor of the group , we can see why ancient and extinct forms so often resemble in their adult state the embryos of existing species of the same class . Agassiz believes this to be a universal law of nature ; and we may ...
... ancient progenitor of the group , we can see why ancient and extinct forms so often resemble in their adult state the embryos of existing species of the same class . Agassiz believes this to be a universal law of nature ; and we may ...
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