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The Descent of Man and Selection in Relation to Sex, Vol. II (1st Edition)

Note 195 — Chapter XIV

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When the Argus pheasant displays his wing-feathers like a great fan, those nearest to the body stand more upright than the outer ones, so that the shading of the ball-and-socket ocelli ought to be slightly different on the different feathers, in order to bring out their full effect, relatively to the incidence of the light. Mr. T. W. Wood, who has the experienced eye of an artist, asserts (‘Field,’ Newspaper, May 28, 1870, p. 457) that this is the case; but after carefully examining two mounted specimens (the proper feathers from one having been given to me by Mr. Gould for more accurate comparison) I cannot perceive that this acme of perfection in the shading has been attained; nor can others to whom I have shewn these feathers recognise the fact.

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