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 248
... breeds of the Pigeon are descended from a single wild species , I compared the young within twelve hours after being hatched ; I carefully measured the proportions ( but will not here give the details ) of the beak , width of mouth ...
... breeds of the Pigeon are descended from a single wild species , I compared the young within twelve hours after being hatched ; I carefully measured the proportions ( but will not here give the details ) of the beak , width of mouth ...
Página 277
... breed . It is certain that he can largely influence the character of a breed by selecting , in each successive generation ... breeds produced by man have to a large extent the character of natural species , is shown by the inextric- able ...
... breed . It is certain that he can largely influence the character of a breed by selecting , in each successive generation ... breeds produced by man have to a large extent the character of natural species , is shown by the inextric- able ...
Página 326
... breeds , i . 23 . advantages of , i . 119 , 120 . unfavourable to selection , i . 125 . Crüger , Dr. , on Coryanthes ... breeds together , ii . 10 . of crosses , ii . 35 . proportions of body in diff r ent breeds , when young , ii . 247 ...
... breeds , i . 23 . advantages of , i . 119 , 120 . unfavourable to selection , i . 125 . Crüger , Dr. , on Coryanthes ... breeds together , ii . 10 . of crosses , ii . 35 . proportions of body in diff r ent breeds , when young , ii . 247 ...
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