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" Under changed conditions of life, it is at least possible that slight modifications of instinct might be profitable to a species; and if it can be shown that instincts do vary ever so little, then I can see no difficulty in natural selection preserving... "
On the Origin of Species by Means of Natural Selection: Or, The Preservation ... - Página 187
por Charles Darwin - 1864 - 440 páginas
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The Squashed Philosophers

Glyn Lloyd-Hughes - 2005 - 412 páginas
...changed conditions of life, it is at least possible that slightly changed instincts might be profitable; and if it can be shown that instincts do vary ever...no difficulty in natural selection preserving and accumulating their variations. But, as with corporeal structures, we ought to find in nature, not the...
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The Origin of Species by Means of Natural Selection: Or, the Preservation of ...

Charles Darwin - 2006 - 608 páginas
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On the Origin of Species

Charles Darwin - 2007 - 556 páginas
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Nature, Volumen26

Sir Norman Lockyer - 1882 - 720 páginas
...important as corporeal structures for the welfare of each species, under its present conditions of life. Under changed conditions of life, it is at least possible...accumulating variations of instinct to any extent that was profitable. It is thus, I believe, that all the most complex and wonderful instincts have originated."...
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Natural Science, Volumen13

1898 - 476 páginas
...Bulletin No. 2. Scientific Series No 1. 1898. IN discussing the problem of Instinct, Darwin wrote, "If it can be shown that instincts do vary ever so...accumulating variations of instinct to any extent that was profitable." This sentence might well serve as the text for the charming book before us, and seems...
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Darwin's Origin of Species

R. W. Sheldon - 2004
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The Quarterly Review of Biology, Volumen3

Raymond Pearl - 1928 - 656 páginas
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