. The descent of man, and selection in relation to sex. Evolution (Biology); Sexual selection in animals; Sexual dimorphism (Animals); Sex differences; Human beings. Chap. XIV.] GRADATION OF CHARACTERS. 131 must formerly have existed many species which presented every successive step between the wonderfully elongated tail-coverts of the peacock and the short tail-coverts of all ordinary birds; and again between the magnificent ocelli of the former, and the simpler ocelli or mere colored spots. Fia. 53.—Feather of Peacock, about two-thirds of natural pizc, carefully drawn by Mr. Ford. The trans
. The descent of man, and selection in relation to sex. Evolution (Biology); Sexual selection in animals; Sexual dimorphism (Animals); Sex differences; Human beings. Chap. XIV.] GRADATION OF CHARACTERS. 131 must formerly have existed many species which presented every successive step between the wonderfully elongated tail-coverts of the peacock and the short tail-coverts of all ordinary birds; and again between the magnificent ocelli of the former, and the simpler ocelli or mere colored spots. Fia. 53.—Feather of Peacock, about two-thirds of natural pizc, carefully drawn by Mr. Ford. The transparent zone is represented by the outermost white zone confined to the upper end of the disk. of other birds; :m<l so with the other characters of the peacock. Let us look to the allied Gallinaceae for any still-existing gradations. The species and Bub-8peoiei of Pblyplectron inhabit countries adjacenl to the native land of the peacock; and they so far resemble this bW that. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Darwin, Charles, 1809-1882. New York: D. Appleton and Company
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