 | Charles Darwin - 1871 - 554 페이지
...for emitting odours ; most of these latter structures serving only to allure or excite the female. That these characters are the result of sexual and...sexual selection ; and it is certain that secondary sexua] characters are eminently variable. In the same manner as man can give beauty, according to his... | |
 | 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... | |
 | George St. Clair - 1873 - 280 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...some advantage, however slight, would suffice for the Mrork of sexual selection ; and it is certain that secondary sexual characters are eminently variable.... | |
 | 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... | |
 | 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
...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...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
...females, which are unarmed and unornamented, are able to survive and procreate their kind. . . . Just as man can improve the breed of his game-cocks by...the improvement of the natural breed or species." "With mammals," says Darwin (loc. ctt., 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... 
