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 112
... less number of cha- racters ; for they would at this early stage of descent have diverged in a less degree from their common progenitor . Thus it comes that ancient and extinct genera are often in a greater or less degree intermediate ...
... less number of cha- racters ; for they would at this early stage of descent have diverged in a less degree from their common progenitor . Thus it comes that ancient and extinct genera are often in a greater or less degree intermediate ...
Página 215
... less variable than the shape or colour of the body , & c .; whereas with sheep the horns are much less serviceable , because less constant . In classing varieties , I apprehend that if we had a real pedigree , a genealogical ...
... less variable than the shape or colour of the body , & c .; whereas with sheep the horns are much less serviceable , because less constant . In classing varieties , I apprehend that if we had a real pedigree , a genealogical ...
Página 262
... less and less during many generations , owing to some change of habits , or if an organ or gland was less and less functionally exercised , we may infer that it would become reduced in size in the adult descendants of this animal , but ...
... less and less during many generations , owing to some change of habits , or if an organ or gland was less and less functionally exercised , we may infer that it would become reduced in size in the adult descendants of this animal , but ...
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