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 31
... manner as do two distinct species when crossed . This led me carefully to observe during four years many seedlings , raised from several illegitimate unions . The chief result is that these illegitimate plants , as they may be called ...
... manner as do two distinct species when crossed . This led me carefully to observe during four years many seedlings , raised from several illegitimate unions . The chief result is that these illegitimate plants , as they may be called ...
Página 285
... manner as the several domestic breeds of the pigeon are descended from the blue and barred rock - pigeon ! On the ordinary view of each species having been independently created , why should specific characters , or those by which the ...
... manner as the several domestic breeds of the pigeon are descended from the blue and barred rock - pigeon ! On the ordinary view of each species having been independently created , why should specific characters , or those by which the ...
Página 293
... manner by the inherited effects of the use and disuse of parts ; and in an unimportant manner , that is in relation to adaptive structures , whether past or present , by the direct action of external condi- tions , and by variations ...
... manner by the inherited effects of the use and disuse of parts ; and in an unimportant manner , that is in relation to adaptive structures , whether past or present , by the direct action of external condi- tions , and by variations ...
Contenido
CONTENTS OF VOL | 1 |
CHAPTER X | 48 |
CHAPTER XII | 129 |
Derechos de autor | |
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The Origin of Species by Means of Natural Selection: Or, The Preservation of ... Charles Darwin Vista de fragmentos - 1962 |
The Origin of Species by Means of Natural Selection: Or, The Preservation of ... Charles Darwin Vista de fragmentos - 1963 |
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