Archive image from page 400 of The descent of man . The descent of man : and selection in relation to sex descentofmansele00indarw Year: 1875 Fig. 45. Secondary wing-feathers of Pipra deliciosa (from Mr. Sclater, in • Proc. Zool. Sec' 1860). The three upper feathers, a, &, c, from the male; the three lower corre- sponding feathers, d, e,/, from tlie female. a and d, fifth secondary wing-feather of male and femalp, upper surface. 6 and e, sixth secondary, upper surface, c and/, seventh secondary, lower surface. if the females were led to select the best performers, the males which possessed th
Archive image from page 400 of The descent of man . The descent of man : and selection in relation to sex descentofmansele00indarw Year: 1875 Fig. 45. Secondary wing-feathers of Pipra deliciosa (from Mr. Sclater, in • Proc. Zool. Sec' 1860). The three upper feathers, a, &, c, from the male; the three lower corre- sponding feathers, d, e,/, from tlie female. a and d, fifth secondary wing-feather of male and femalp, upper surface. 6 and e, sixth secondary, upper surface, c and/, seventh secondary, lower surface. if the females were led to select the best performers, the males which possessed the strongest or thickest, or most attenuated feathers, situated on any part of the body, would be the most successful; and thus by slow degrees the feathers might be modified to almost any extent. The females, of course, would not notice each slight successive alteration in shape, but only
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