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 1
... inhabitants of South America , and in the geological relations of the present to the past inhabitants of that continent . These facts seemed to me to throw some light on the origin of species - that mystery of mysteries , as it has been ...
... inhabitants of South America , and in the geological relations of the present to the past inhabitants of that continent . These facts seemed to me to throw some light on the origin of species - that mystery of mysteries , as it has been ...
Página 5
... inhabitant of this world . Still less do we know of the mutual relations of the innumerable inhabitants of the world during the many past geological epochs in its history . Although much remains obscure , and will long remain obscure ...
... inhabitant of this world . Still less do we know of the mutual relations of the innumerable inhabitants of the world during the many past geological epochs in its history . Although much remains obscure , and will long remain obscure ...
Página 37
... inhabitants - slowly to add to the characteristic features of the breed , whatever they may be . But the chance will be infinitely small of any record having been preserved of such slow , varying , and insensible changes . I must now ...
... inhabitants - slowly to add to the characteristic features of the breed , whatever they may be . But the chance will be infinitely small of any record having been preserved of such slow , varying , and insensible changes . I must now ...
Página 38
... inhabitants of open plains rarely possess more than one breed of the same species . Pigeons can be mated for life , and this is a great convenience to the fancier , for thus many races may be kept true , though mingled in the same ...
... inhabitants of open plains rarely possess more than one breed of the same species . Pigeons can be mated for life , and this is a great convenience to the fancier , for thus many races may be kept true , though mingled in the same ...
Página 50
... inhabitants of the country , the species which are already dominant will be the most likely to yield offspring , which , though in some slight degree modi- fied , still inherit those advantages that enabled their parents to become ...
... inhabitants of the country , the species which are already dominant will be the most likely to yield offspring , which , though in some slight degree modi- fied , still inherit those advantages that enabled their parents to become ...
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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