 | George St. Clair - 1873 - 296 페이지
...nature female birds, by having long selected the more attractive males, have added to their beauty. In the same manner as man can improve the breed of...secondary sexual characters are eminently variable. The Accumulation of Variations by Natural Selection (or the Struggle for Existence}. — The cases... | |
 | Charles Darwin - 1874 - 840 페이지
...instinct, they know what they are about, and consciously exert their mental and bodily powers. Just as man can improve the breed of his game-cocks by...to the improvement of the natural breed or species. A slight degree of variability leading to some advantage, however slight, in reiterated deadly contests... | |
 | Grant Allen - 1885 - 236 페이지
...the breed of his gamecocks by the selection of those birds which are victorious in the cockpit, so the strongest and most vigorous males, or those provided with the best weapons, have prevailed in the state of nature over their feebler and more cowardly competitors. Just as man can give beauty,... | |
 | Charles Darwin - 1888 - 718 페이지
...the breed of his game-cocks by the selection of those birds wliich are victorious in the cockpit, BO it appears that the strongest and most vigorous males,...to the improvement of the natural breed or species. A slight degree of variability leading to some advantage, however slight, in riiterated deadly contests... | |
 | Charles Darwin - 1896 - 890 페이지
...his game-cocks by the selection of those birds which are victorious in the cockpit, so it apj>ears that the strongest and most vigorous males, or those...to the improvement of the natural breed or species. A slight degree of variability leading to some advantage, however slight, in reiterated deadly contests... | |
 | Charles Darwin - 1902 - 238 페이지
...those birds which are victorious in the cockpit, so it appears that the strongest and most vigorous 100 males, or those provided with the best weapons, have...and have led to the improvement of the natural breed of species. A slight degree of variability leading to some advantage, however slight, in reiterated... | |
 | Thomas Hunt Morgan - 1903 - 498 페이지
...this process and that of artificial selection may be gathered from the following statement : — "Just as man can improve the breed of his game-cocks by...to the improvement of the natural breed or species. A slight degree of variability leading to some advantage, however slight, in reiterated deadly contests... | |
 | 1905 - 462 페이지
...inatinct, they know what they are about, and consciously exert their mental and bodily powers. Just as man can improve the breed of his game-cocks by...to the improvement of the natural breed or species. A slight degree of variability leading to some advantage, however slight, in reiterated deadly contests... | |
 | Thomas Nixon Carver - 1905 - 826 페이지
...instinct, they know what they are about, and consciously exert their mental and bodily powers. Just as man can improve the breed of his gamecocks by the...to the improvement of the natural breed or species. A slight degree of variability leading to some advantage, however slight, in reiterated deadly contests... | |
 | Douglas Dewar, Frank Finn - 1909 - 452 페이지
...those birds which are victorious in the cockpit, so it appears that the strongest and most vigorous 301 males, or those provided with the best weapons, have...the improvement of the natural breed or species." "With mammals," says Darwin (foe. cit., p. 763), " the male appears to win the female much more through... | |
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Just as man can improve the breed of his gamecocks by the selection of those birds which are victorious in the cockpit, so it appears that the strongest and most vigorous males, or those provided with the best weapons, have prevailed under nature, and... 
