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 54
Página 95
... single species or any single genus endures . There is reason to believe that the extinction of a whole group of species is generally a slower process than their pro- duction if their appearance and disappearance be re- presented , as ...
... single species or any single genus endures . There is reason to believe that the extinction of a whole group of species is generally a slower process than their pro- duction if their appearance and disappearance be re- presented , as ...
Página 139
... single pair , or single hermaphrodite , or whether , as some authors suppose , from many individuals simultaneously created . With organic beings which never intercross , if such exist , each species must be de- scended from a ...
... single pair , or single hermaphrodite , or whether , as some authors suppose , from many individuals simultaneously created . With organic beings which never intercross , if such exist , each species must be de- scended from a ...
Página 140
... single parent . To illustrate what I mean : our English race - horses differ from the horses of every other breed ; but they do not owe their difference and superiority to descent from any single pair , but to continued care in the ...
... single parent . To illustrate what I mean : our English race - horses differ from the horses of every other breed ; but they do not owe their difference and superiority to descent from any single pair , but to continued care in the ...
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