On The Origin Of SpeciesHarper Collins, 22 июл. 2014 г. - Всего страниц: 336 Published in 1859, The Origin of Species by Charles Darwin introduced the theory of natural selection to a newly-receptive public. As a young naturalist on the second voyage of HMS Beagle (1831-36), Darwin collected many plant and animal specimens, and it was his close examination of them that eventually led to his theories on evolution and natural selection. HarperPerennial Classics brings great works of literature to life in digital format, upholding the highest standards in ebook production and celebrating reading in all its forms. Look for more titles in the HarperPerennial Classics collection to build your digital library. |
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... crossing of distinct species, and that which may be observed with plants and animals when reared under new or unnatural conditions. Many facts clearly show how eminently susceptiblethe reproductive systemisto veryslight changes in the ...
... crossing of distinct species, and that which may be observed with plants and animals when reared under new or unnatural conditions. Many facts clearly show how eminently susceptiblethe reproductive systemisto veryslight changes in the ...
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... crossed—a subject hereafter to be discussed), domestic races of the same species differ from each other in the same manner as do theclosely allied species of the same genus in a stateof nature, but thedifferences inmost casesareless in ...
... crossed—a subject hereafter to be discussed), domestic races of the same species differ from each other in the same manner as do theclosely allied species of the same genus in a stateof nature, but thedifferences inmost casesareless in ...
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... crossed them, and examined their skeletons, it appearsto me almost certain that all are the descendants of the wild Indianfowl, Gallusbankiva; and thisisthe conclusion of Mr. Blyth, andof otherswho have studied this birdinIndia. In ...
... crossed them, and examined their skeletons, it appearsto me almost certain that all are the descendants of the wild Indianfowl, Gallusbankiva; and thisisthe conclusion of Mr. Blyth, andof otherswho have studied this birdinIndia. In ...
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... crossing of a few aboriginal species; but by crossing we can only getforms in some degree intermediate between their ... crossed one with another for several generations, hardly two of them are alike, and then the difficulty of the task ...
... crossing of a few aboriginal species; but by crossing we can only getforms in some degree intermediate between their ... crossed one with another for several generations, hardly two of them are alike, and then the difficulty of the task ...
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... crossing of any lesser number: how,for instance, could apouter beproducedby crossingtwo breeds unless oneof theparentstocks possessed the characteristic enormous crop? Thesupposed aboriginal stocks must all have been rockpigeons, that ...
... crossing of any lesser number: how,for instance, could apouter beproducedby crossingtwo breeds unless oneof theparentstocks possessed the characteristic enormous crop? Thesupposed aboriginal stocks must all have been rockpigeons, that ...
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according adapted admit advantage allied America amount animals appear become believe belonging birds breeds cause certain characters climate closely color common compared complex considerable considered continued crossed descendants developed difficulty distinct domestic doubt effects existing extinct extremely facts favourable fertility flowers formation forms genera genus geological give given greater groups habits Hence hybrids important increase individuals inhabitants inherited insects instance instincts intermediate inthe islands kind known laws less living look manner means modification namely natural selection naturalists nearly observed occasionally occur offspring ofthe onthe organs parent perfect period plants points present preserved principle probably produced remarked represented resemblance respect seeds seems seen separated shown similar single slight sometimes species stage sterility structure successive suppose theory thesame tothe variability variations varieties various vary whole widely young