[105]

Sexual Selection

Take Peacock-feather give woodcut - give gradations - Here only select general beauty. Laws of change - infinite difficulty - Though an action must be assumed from beauty - my greatest difficulty - Consider some few laws - Characters appear from descent from allied form - spangling & [illeg] in Hens. When a character appears in one part - by connection spreads - Hackles on crest of Poland- saddle hackles on G. bankiva black shaft- spreads. Where any bar or mark appears colours may be replaced - wings of pigeons- (Colour may spread symmetrically up shaft - In some cases the colour spreads symmetrically up the shaft as in cross from silver - Poland & Spanish cock. But what is more important when colour changes from one part of feather to other, a symmetrical border marks passage. (this chief wonder in Peacocks eye) Thus in cross Poland & Spanish - shaft greenish black - edge broadly brown white - intermediate dark brown) Mongrel from Spanish & white game whole feather black glossed with green, tipped with yellowish white - always symmetrical zone between of dark-brown. Again take case of bars of pigeon wings - New white zones of colour.

Spots of [Butterflies]