 | 1902 - 874 pàgines
...natural selection of numerous successive, slight, favorable variations; aided In an important manner Ъу the inherited effects of the use and disuse of parts;...seem to us in our ignorance to arise spontaneously. It appears that I formerly underrated the frequency and value of these latter forms of variation, as... | |
 | 1876 - 828 pàgines
...unimportant manner — that is, in relation to adaptive structures, whether past or present — by tho direct action of external conditions, and by variations...seem to us, in our ignorance, to arise spontaneously. As my conclusions have lately been much misrepresented, and it has been stated that I attribute the... | |
 | 1909 - 846 pàgines
...the use and disuse of parts, and in an important manner, that is in relation to adaptive structure, whether past or present, by the direct action of external...seem to us in our ignorance to arise spontaneously. It appears that I formerly underrated the frequency and value of these latter forms of variation, as... | |
 | 1909 - 838 pàgines
...the use and disuse of parts, and in an important manner, that is in relation to adaptive structure, whether past or present, 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 the... | |
 | American Association for the Advancement of Science - 1875 - 390 pàgines
...in 1853 (Lehrbuch der Physiologic), endeavored to explain Evolution by so-called germ-metamorphosis, periodic transmutations of the embryo in its primitive...of local isolation has been sought to be determined (Weiss111:1i111, Einfluss der Isolirung auf die Artbildung, Leipzig, 1872). More recently still, Nageli... | |
 | American Association for the Advancement of Science - 1875 - 406 pàgines
...endeavored to explain Evolution by so-called germ-metamorphosis, periodic transmutations of the embiyo in its primitive stages, — something similar to...of local isolation has been sought to be determined (Weissjnaiui, Einfluss der Isolirung auf die Artbildung, Leipzig, 1872). More recently still, Nageli... | |
 | Charles Darwin - 1875 - 504 pàgines
...has been effected chiefly through tho natural selection of numerous successive, slight, favourable variations ; aided in an important manner by the inherited...seem to us in our ignorance to arise spontaneously. It appears that I formerly underrated the frequency and value of these latter forms of variation, as... | |
 | 1876 - 898 pàgines
...have thoroughly convinced me that species have been modified during a long course of descent. This has been effected chiefly through the natural selection...seem to us, in our ignorance, to arise spontaneously. As my conclusions have lately been much misrepresented, and it has been stated that I attribute the... | |
 | 1903 - 554 pàgines
...has been effected chiefly through the natural selection of numerous successive, slight, favourable variations ; aided in an important manner by the inherited...seem to us in our ignorance to arise spontaneously. It appears that I formerly underrated the frequency and value of these latter forms of variation, as... | |
 | 1881 - 334 pàgines
...have thoroughly convinced me that species have been modified during a long course of descent. This has been effected chiefly through the natural selection...seem to us in our ignorance to arise spontaneously. It appears that I formerly underrated the frequency and value of these latter forms of variation, as... | |
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I have now recapitulated the facts and considerations which have thoroughly convinced me that species have been modified, during a long course of descent. This has been effected chiefly through the natural selection of numerous successive, slight, favourable... 
