Title: The descent of man, and selection in relation to sex
Identifier: descentofmansel02darw (find matches)
Year: 1871 (1870s)
Authors: Darwin, Charles, 1809-1882
Subjects: Evolution (Biology); Sexual selection in animals; Sexual dimorphism (Animals); Sex differences; Human beings
Publisher: New York, D. Appleton and company
Contributing Library: Princeton Theological Seminary Library
Digitizing Sponsor: Princeton Theological Seminary Library

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Chap. XIV.) GRADATION OF CHARACTER, 137 toward the left-Land upper corner, the feather being held erect, in the position a b c in which it is here drawn. Beneath this thickened part there is on the surface of the ball an oblique almost pure-white mark whicli shades ofi downward into a pale-leaden hue, and this into yellow- ish and brown tints, which insensibly be- come darker and dark- er toward the lower part of the ball. It is this shading, which gives so admirably the effect of light shining on a convex surface. If one of the balls be examined, it will be seen that the loAver part is of a browner lint oiirl iflxr Fig. 56.—Part of Secondary winsr-reather of imt ana is maiSlinctiy ^^.^^^ pheasanf, showing two. « anrl b, per- HPnfiTntpfl \\\r o piir-eprl feet ocelli. A, B, C, etc.. dark stripes run- Sepai area Oy a CUrveCl ^^^^^ obliquely down, each to an ocellus. oblique line from the (Much of the web on both sides, especially to . the left of the shaft, has been cut off)- upper part, which is yellower and more leaden; this oblique line runs at right angles to the longer axis of the wliite patch of light, and indeed of all the shading; but this difference in the tints, which cannot of course be shown in the woodcut, does not in the least interfere with the perfect shading of the ball.^^ *s When the Argus pheasant displays his wing-feathers hke a great fan, those nearest to the body stand more upright than the outer ones,
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