 | William James - Psychology - 1902 - 728 pages
...important as corporeal structure for the welfare of each species, under its present conditions of life. Under changed conditions of life, it is at least possible...be profitable. It is thus, as I believe, that all tho most complex and wonderful instincts have arisen. ... I believe that the effects of habit are of... | |
 | 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...accumulating variations of instinct to any extent that was profitable. It is thus, as I believe, that all the most complex and wonderful instincts have originated."... | |
 | 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...accumulating variations of instinct to any extent that was profitable. It is thus, as I believe, that all the most complex and wonderful instincts have originated.... | |
 | 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...accumulating variations of instinct to any extent that was profitable. It is thus, as I believe, that all the most complex and wonderful instincts have originated."... | |
 | Emil Carl Wilm - Instinct - 1925 - 224 pages
...History of 10 Cf. the following more recent accounts of instinct : "If it can be shown that instincts vary ever so little, then I can see no difficulty...accumulating variations of instinct to any extent that was profitable. It is thus, as I believe, that all the most complex and wonderful instincts have originated."... | |
 | Carl John Warden - Psychology, Comparative - 1927 - 104 pages
...accumulation of favorable variations in the struggle of the organism to survive. "If it can be shown (he says) that instincts do vary ever so little, then I can...accumulating variations of instinct to any extent profitable. It is thus, I believe, that all the most wonderful and complex instincts have originated."... | |
| |
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... 
