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From J. J. Weir   [4–7] May 1868

Summary

Proportion of sexes in ruffs [see Descent 1: 306].

Colour display in linnets, songbirds. Courtship display of Australian pigeon at zoo.

Author:  John Jenner Weir
Addressee:  Charles Robert Darwin
Date:  [4–7] May 1868
Classmark:  DAR 84.1: 75–6, DAR 86: C3–4
Letter no:  DCP-LETT-6151