 ... variations; aided in an important manner by the inherited effects of the use and disuse of parts; and in an unimportant manner, that is, in relation to adaptive structures, whether past or present, by the direct action of external conditions, and...  The Science-history of the Universe - Página 225editado por - 1909Vista completa - Acerca de este libro
 | 1909 - 838 páginas
...by the direct action of external conditions, and by variations rvhich seem to us in our ignorance to arise spontaneously. It appears that I formerly underrated...modifications of structure independently of natural selection, . . . He adds, in answer to certain recent criticisms that he placed at the end of the introduction... | |
 | Nicholas Patrick Wiseman - 1872 - 542 páginas
...by the direct action of- external conditions, and by variations which seem to us in our ignorance to arise spontaneously. It appears that I formerly underrated...variation, as leading to permanent modifications of structures independently of natural selection." (p. 421.) But, he continues, " I may be permitted to... | |
 | Charles Darwin - 1882 - 492 páginas
...by the direct action of external conditions, and by variations which seem to us in our ignorance to arise spontaneously. It appears that I formerly underrated...as leading to permanent modifications of structure inde|iendeutly of natural selection. But as my conclusions have lately been much misrepresented, and... | |
 | Charles Darwin - 1883 - 494 páginas
...by the direct action of external conditions, and by variations which seem to us in our ignorance to arise spontaneously. It appears that I formerly underrated...misrepresented, and it has been stated that I attribute the modi6cation of species exclusively to natural selection, I may be permitted to remark that in the first... | |
 | Charles Darwin - 1889 - 368 páginas
...by the direct action of external conditions, and by variations which seem to us in our ignorance to arise spontaneously. It appears that I formerly underrated...species exclusively to natural selection, I may be per-_ mitted to remark that in the first edition of this work, and subsequently, I placed in a most... | |
 | George John Romanes - 1895 - 434 páginas
...variations, in which the nature of the conditions plays quite a subordinate part V Elsewhere he says, — " It appears that I formerly underrated the frequency...modifications of structure independently of natural selection V The " forms of variation " to which he here alludes are " variations which seem to us in our ignorance... | |
 | George John Romanes - 1895 - 380 páginas
...variations, in which the nature of the conditions plays quite a subordinate part V Elsewhere he says, — " It appears that I formerly underrated the frequency...modifications of structure independently of natural teUciicn *." The " forms of variation " to which he here alludes are " variations which seem to us... | |
 | Charles Darwin - 1902 - 770 páginas
...by the direct action of external conditions, and by variations which seem to us in our ignorance to arise spontaneously. It appears that I formerly underrated...natural selection, I may be permitted to remark that iu the first edition of this work, and subsequently, I placed in a most conspicuous position — namely,... | |
 | 1902 - 200 páginas
...by the direct action of external conditions, and by variations which seem to us in our ignorance to arise spontaneously. It appears that I formerly underrated...variation, as leading to permanent modifications of 18 structure independently of natural selection. But as my conclusions have lately been much misrepresented,... | |
 | John Boyd Kinnear - 1905 - 228 páginas
...by the direct action of external conditions, and by variations which seem to us in our ignorance to arise spontaneously. It appears that I formerly underrated the frequency and value of these forms of variation, as leading to permanent modifications of structure independently of natural selection.'... | |
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