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" ... the wingless condition of so many Madeira beetles is mainly due to the action of natural selection, combined probably with disuse. For during many successive generations each individual beetle which flew least, either from its wings having been ever... "
The Shrewsbury Edition of the Works of Samuel Butler: Evolution, old and new - Página 327
por Samuel Butler - 1924
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Eclectic and Congregational Review

1860 - 966 páginas
...never flying."* Then in tLe s;une page the author adds that certain considerations have mude him " believe that the wingless condition of so many Madeira...is mainly due to the action of natural selection, but combined probably with disuse. For during thousands of 4ii-Cf4<ive generations each individual...
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On the Origin of Species by Means of Natural Selection; Or, The Preservation ...

Charles Darwin - 1861 - 470 páginas
...have habits of life almost necessitating frequent flight ; — these several considerations have made me believe that the wingless condition of so many...is mainly due to the action of natural selection, but combined probably with disuse. For during thousands of successive generations each individual beetle...
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On the Origin of Species by Means of Natural Selection: Or, The Preservation ...

Charles Darwin - 1864 - 472 páginas
...have habits of life almost necessitating frequent flight ; — these several considerations have made me believe that the wingless condition of so many...is mainly due to the action of natural selection, but combined probably with disuse. For during thousands of successive generations each individual beetle...
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The Popular Science Monthly, Volumen15

1879 - 978 páginas
...Madeira. How may the absence of wings in the Madeiran beetles be accounted fo^- ? Let Mr. Darwin reply : " Several considerations make me believe that the wingless...is mainly due to the action of natural selection, combined probably with disuse. For during many successive generations each individual beetle •which...
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The Origin of Species by Means of Natural Selection: Or, The Preservation of ...

Charles Darwin - 1873 - 492 páginas
...numerous, which absolutely require the use of their wings, are here almost entirely absent;—these several considerations make me believe that the wingless...is mainly due to the action of natural selection, combined probably with disuse. For • during many successive generations each individual beetle which...
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Winds of Doctrine: Being an Examination of the Modern Theories of Automatism ...

Charles Elam - 1876 - 186 páginas
...Mivart, in his Lessons from Nature, p. 300. 2 Origin of Species, p. 136. NATURAL SELECTION. 127 less condition of so many Madeira beetles is mainly due to the action of natural selection, but combined probably with disuse. For during thousands of successive generations each individual beetle...
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Eclectic Magazine: Foreign Literature, Volumen25;Volumen88

John Holmes Agnew, Walter Hilliard Bidwell, Henry T. Steele - 1877 - 812 páginas
...never flying." * Then in the same page the author adds that certain considerations have made him " believe that the wingless condition of so many Madeira...is mainly due to the action of natural selection, but combined probably with disuse. For during thousands of successive generations each individual beetle...
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The Contemporary Review, Volumen29

1877 - 1212 páginas
...the same page the author adds that certain considerations have made him " believe that the wiiigless condition of so many Madeira beetles is mainly due to the action of natural selection, but combined probably with disuse. For during thousands of successive generations each individual beetle...
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Evolution, Old and New: Or, the Theories of Buffon, Dr. Erasmus Darwin, and ...

Samuel Butler - 1879 - 436 páginas
...and that though it would be easy to set it down to disuse, yet we must on no account do so. The facts having been stated, Mr. Darwin continues:— " These...do with the matter. We feel a languid wish to know exactly how much and in what way it has entered into the combination ; but we find it difficult to...
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The Gentleman's Magazine, Volumen246

1879 - 794 páginas
...Madeira. How may the absence of wings in the Madeiran beetles be accounted for ? Let Mr. Darwin reply : " Several considerations make me believe that the wingless...is mainly due to the action of natural selection, combined probably with disuse. For during many successive generations each individual beetle which...
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