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 i<j inrli«tinr>flxr 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, 



