 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...  The Darwinian Theory of the Transmutation of Species - Page 52by Robert Mackenzie Beverley - 1867 - 386 pagesFull view - About this book
 | Charles Clement Coe - Evolution - 1895 - 648 pages
...favourable so long as the conditions remain unaltered. This is implied by Mr. Darwin when he says : " Under changed conditions of life it is at least possible...modifications of instinct might be profitable to a species."J In the next place instincts must vary slightly. " Natura non facit saltum is applicable... | |
 | Charles Darwin - Science - 1896 - 408 pages
...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...instinct to any extent that was profitable. It is thus, as I believe, that all the most complex and wonderful instincts have originated. As modifications of... | |
 | Charles Darwin - Evolution - 1896 - 406 pages
...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...species ; and if it can be shown that instincts do varyever so little, then I can see no difficulty in natural selection preserving and continually accumulating... | |
 | Jacob Gould Schurman - Ethics, Evolutionary - 1903 - 292 pages
...Darwin. Divorcing his science therefrom, he elsewhere admirably describes his position in these words : " If it can be shown that instincts do vary ever so...instinct to any extent that was profitable. It is thus, as I believe, that all the most complex and wonderful instincts have originated." Here, as always,... | |
 | David Syme - Instinct - 1903 - 280 pages
...says, " that slight variations might be profitable to a species, and if it can be shown these instincts vary ever so little, then I can see no difficulty...preserving and continually accumulating variations of instincts to any extent that was profitable. It is thus, as I believe, that all the complex and wonderful... | |
 | David Syme - Instinct - 1903 - 276 pages
...the origin of instinct are well known. " It is at least possible," he says, " that slight variations might be profitable to a species, and if it can be shown these instincts vary ever so little, then I can see no difficulty in natural selection preserving and... | |
 | Charles Darwin - Evolution - 1909 - 584 pages
...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...instinct to any extent that was profitable. It is thus, as I believe, that all the most complex and wonderful instincts have originated. As modifications of... | |
 | Samuel Jackson Holmes - 1911 - 318 pages
...as corporeal structures for the welfare of each species under its present conditions of life. . . . If it can be shown that instincts do vary ever so...instinct to any extent that was profitable. It is thus, as I believe, that all the most complex and wonderful instincts have originated." — DARWIN, Origin... | |
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