The Origin of Species by Means of Natural Selection: Or, The Preservation of Favored Races in the Struggle for Life, Volumen2AMS Press, 1972 |
Dentro del libro
Resultados 1-3 de 84
Página 98
... forms and the disappearance of old forms , both those naturally and those artificially produced , are bound together . In flourishing groups , the number of new specific forms which have been produced within a given time has at some ...
... forms and the disappearance of old forms , both those naturally and those artificially produced , are bound together . In flourishing groups , the number of new specific forms which have been produced within a given time has at some ...
Página 127
... forms often tend to fill up gaps between existing forms , sometimes blending two groups , previously classed as distinct , into one ; but more commonly bringing them only a little closer together . The more ancient a form is , the more ...
... forms often tend to fill up gaps between existing forms , sometimes blending two groups , previously classed as distinct , into one ; but more commonly bringing them only a little closer together . The more ancient a form is , the more ...
Página 167
... forms having existed in their own homes in greater numbers , and having consequently been advanced through natural selection and competition to a higher stage of perfection , or dominating power , than the southern forms . And thus ...
... forms having existed in their own homes in greater numbers , and having consequently been advanced through natural selection and competition to a higher stage of perfection , or dominating power , than the southern forms . And thus ...
Contenido
CONTENTS OF VOL | 1 |
CHAPTER X | 48 |
CHAPTER XII | 129 |
Derechos de autor | |
Otras 2 secciones no mostradas
Otras ediciones - Ver todas
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