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 255
... wing " may safely be considered as a rudimentary digit , and in some species the whole wing is so far rudimentary that ... wings . Rudimentary organs sometimes retain their potentiality : this occasionally occurs with the mammæ of male ...
... wing " may safely be considered as a rudimentary digit , and in some species the whole wing is so far rudimentary that ... wings . Rudimentary organs sometimes retain their potentiality : this occasionally occurs with the mammæ of male ...
Página 258
... wing of the penguin is of high service , acting as a fin ; it may , therefore , represent the nascent state of the wing ... wings of female moths belonging to the same family . Rudimentary organs may be utterly aborted ; and this implies ...
... wing of the penguin is of high service , acting as a fin ; it may , therefore , represent the nascent state of the wing ... wings of female moths belonging to the same family . Rudimentary organs may be utterly aborted ; and this implies ...
Página 313
... wings horny in the basal portion and membranous at the extremity , where they cross each other . This group includes the various species of Bugs . HERMAPHRODITE . - Possessing the organs of both sexes . HOMOLOGY . - That relation ...
... wings horny in the basal portion and membranous at the extremity , where they cross each other . This group includes the various species of Bugs . HERMAPHRODITE . - Possessing the organs of both sexes . HOMOLOGY . - That relation ...
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