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![Darwin, C. R. 1871. The descent of man, and selection in relation to sex. London: John Murray. Volume. 2. 1st edition. Darwin, C. R. 1871. The descent of man, and selection in relation to sex. London: John Murray. Volume. 2. 1st edition.](http://darwin-online.org.uk/converted/published/1871_Descent_F937/1871_Descent_F937.2_fig25.jpg)
Darwin, C. R. 1871. The descent of man, and selection in relation to sex. London: John Murray. Volume. 2. 1st edition.
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