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
... 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 called by one of our ...
... 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 called by one of our ...
Página 45
... America and Europe , which differ very slightly from each other , have been ranked by one eminent naturalist as undoubted species , and by another as varieties , or , as they are often called , as geographical races ! Many years ago ...
... America and Europe , which differ very slightly from each other , have been ranked by one eminent naturalist as undoubted species , and by another as varieties , or , as they are often called , as geographical races ! Many years ago ...
Página 60
... America , and latterly in Australia , had not been well authenticated , they would have been incredible . So it is with plants : cases could be given of introduced plants which have become common throughout whole islands in a period of ...
... America , and latterly in Australia , had not been well authenticated , they would have been incredible . So it is with plants : cases could be given of introduced plants which have become common throughout whole islands in a period of ...
Página 62
... America . Here I will make only a few remarks , just to recall to the reader's mind some of the chief points . Eggs or very young animals seem generally to suffer most , but this is not invariably the case . With plants there is a vast ...
... America . Here I will make only a few remarks , just to recall to the reader's mind some of the chief points . Eggs or very young animals seem generally to suffer most , but this is not invariably the case . With plants there is a vast ...
Página 67
... America ) the vegetation : this again would largely affect the insects ; and this , as we just have seen in Staffordshire , the insectivorous birds , and so onwards in ever - increasing circles of complexity . We began this series by ...
... America ) the vegetation : this again would largely affect the insects ; and this , as we just have seen in Staffordshire , the insectivorous birds , and so onwards in ever - increasing circles of complexity . We began this series by ...
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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