On the Origin of Species by Means of Natural Selection: Or The Preservation of Favoured Races in the Struggle for LifeHumphrey Milford, Oxford University Press, 1923 - 454 páginas |
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Página 25
... offspring perfectly fertile , inter se , seems to me rash in the extreme . From these several reasons , namely , the improbability of man having formerly got seven or eight supposed species of pigeons to breed freely under domestica ...
... offspring perfectly fertile , inter se , seems to me rash in the extreme . From these several reasons , namely , the improbability of man having formerly got seven or eight supposed species of pigeons to breed freely under domestica ...
Página 33
... offspring of their domestic animals , yet any one animal particularly use- ful to them , for any special purpose , would be carefully preserved during famines and other accidents , to which savages are so liable , and such choice ...
... offspring of their domestic animals , yet any one animal particularly use- ful to them , for any special purpose , would be carefully preserved during famines and other accidents , to which savages are so liable , and such choice ...
Página 42
... offspring from the same parents , or which may be presumed to have thus arisen , from being frequently observed in the indivi- duals of the same species inhabiting the same confined locality . No one supposes that all the individuals of ...
... offspring from the same parents , or which may be presumed to have thus arisen , from being frequently observed in the indivi- duals of the same species inhabiting the same confined locality . No one supposes that all the individuals of ...
Página 50
... offspring , which , though in some slight degree modi- fied , still inherit those advantages that enabled their parents to become dominant over their compatriots . If the plants inhabiting a country and described in any Flora be divided ...
... offspring , which , though in some slight degree modi- fied , still inherit those advantages that enabled their parents to become dominant over their compatriots . If the plants inhabiting a country and described in any Flora be divided ...
Página 57
... offspring . The off- spring , also , will thus have a better chance of surviving , for , of the many individuals of any species which are periodically born , but a small number can survive . have called this principle , by which each ...
... offspring . The off- spring , also , will thus have a better chance of surviving , for , of the many individuals of any species which are periodically born , but a small number can survive . have called this principle , by which each ...
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Términos y frases comunes
accumulated adapted affinities allied species America amount analogous ancient appear Archipelago become bees believe birds breeds cause cells characters cirripedes climate closely allied colour common parent continuous crossed crustaceans degree difficulty distinct species divergence doubt embryo endemic Europe existing exterminated extinct extremely facts favourable fertility flowers formations forms fossil Gärtner genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hermaphrodites hybrids hybrids produced important individuals inhabitants inherited insects instance instincts intercrossing land larvæ less living male mammals manner Marsupials migration modification modified descendants natural selection naturalists nearly nest oceanic islands offspring organisation perfect pigeons pistil plants pollen present principle probably produced progenitor ranked reciprocal crosses remarked resemble rock-pigeon rudimentary organs seeds sexual selection Silurian slight South America sterility structure struggle successive suppose swimbladder tend theory tion trees variability variation vary whole widely