. 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. 143 to the uppermost ocellus (b) is represented only by a very short irregular black mark with the usual, curved, trans- verse base. As this stripe is thus abruptly cut off above, we can understand, from what has gone before, how it is that the upper thickened part of the ring is absent in the uppermost ocellus ; for, as before stated, this thickened part is apparently formed by a broken prolon
. 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. 143 to the uppermost ocellus (b) is represented only by a very short irregular black mark with the usual, curved, trans- verse base. As this stripe is thus abruptly cut off above, we can understand, from what has gone before, how it is that the upper thickened part of the ring is absent in the uppermost ocellus ; for, as before stated, this thickened part is apparently formed by a broken prolongation of the next higher spot in the same row. From the absence of the upper and thickened part of the ring, the upper- most ocellus, though perfect in all other respects, appears as if its top had been ob- liquely sliced off. It would, I think, perplex any one, who believes that the plumage of the Argus pheasant was cre- ated as we now see it, to ac- count for the imperfect condi- tion of the uppermost ocelli. I should add that in the sec- ondary wing-feather farthest from the body all the ocelli are smaller and less perfect âPortion near summit of oue , ^ , of the Secondary wine-feathers, than on the other feathers, bearing perfect ball-and-socliet with the upper parts of the â Omamented upper part. external black rings deficient, 'â YPJlT^ocdilr'S 'silldS as in the case just mentioned. l^^^^^,,^ .lI^'^LCisTere'l The imperfection here seems ^ perfec\°ocenus? to be connected with the fact that the spots on tins feather show less tendency than. 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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