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
... rudimentary condition . In the mam- malia , for instance , the males possess rudimentary mammæ ; in snakes one lobe of the lungs is rudimen- tary ; in birds the " bastard - wing " may safely be considered as a rudimentary digit , and in ...
... rudimentary condition . In the mam- malia , for instance , the males possess rudimentary mammæ ; in snakes one lobe of the lungs is rudimen- tary ; in birds the " bastard - wing " may safely be considered as a rudimentary digit , and in ...
Página 257
... rudimentary . They may be in a nascent condition , and in progress towards further development . Rudimentary organs , on the other hand , are either quite useless , such as teeth which never cut through the gums , or almost useless ...
... rudimentary . They may be in a nascent condition , and in progress towards further development . Rudimentary organs , on the other hand , are either quite useless , such as teeth which never cut through the gums , or almost useless ...
Página 263
... rudimentary and would at last be wholly suppressed ; for the variations towards diminished size would no longer be checked by natural selection . The principle of the economy of growth , explained in a former chapter , by which the ...
... rudimentary and would at last be wholly suppressed ; for the variations towards diminished size would no longer be checked by natural selection . The principle of the economy of growth , explained in a former chapter , by which the ...
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