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 41
... parent - form . Now hybrids in the first generation are descended from species ( excluding those long - cultivated ) which have not had their reproductive systems in any way affected , and they are not variable ; but hybrids themselves ...
... parent - form . Now hybrids in the first generation are descended from species ( excluding those long - cultivated ) which have not had their reproductive systems in any way affected , and they are not variable ; but hybrids themselves ...
Página 50
... parent . The common parent will have had in its whole organisation much general re- semblance to the tapir and to the horse ; but in some points of structure may have differed considerably from both , even perhaps more than they differ ...
... parent . The common parent will have had in its whole organisation much general re- semblance to the tapir and to the horse ; but in some points of structure may have differed considerably from both , even perhaps more than they differ ...
Página 51
... parent , will render this a very rare event ; for in all cases the new and improved forms of life tend to supplant the old and unimproved forms . By the theory of natural selection all living species have been connected with the parent ...
... parent , will render this a very rare event ; for in all cases the new and improved forms of life tend to supplant the old and unimproved forms . By the theory of natural selection all living species have been connected with the parent ...
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