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From George Rogers   4 June 1868

Summary

Suggests variation in seed-covering membranes as a cause of variation in plants.

Author:  George Rogers
Addressee:  Charles Robert Darwin
Date:  4 June 1868
Classmark:  DAR 176: 193
Letter no:  DCP-LETT-6227

To H. B. Tristram   4 June 1868

Summary

Asks about camouflage of birds in the Sahara desert.

Author:  Charles Robert Darwin
Addressee:  Henry Baker Tristram
Date:  4 June 1868
Classmark:  Private collection
Letter no:  DCP-LETT-6227F

From E. W. Janson   4 June 1868

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Summary

Sends specimens of Coleoptera.

Quotes from W. F. Erichson [Naturgeschichte der Insecten Deutschlands 3: 927] on stridulating organs in Trox.

Author:  Edward Westey Janson
Addressee:  Charles Robert Darwin
Date:  4 June 1868
Classmark:  DAR 82: A101–2
Letter no:  DCP-LETT-6228

From T. H. Farrer   4 June 1868

Summary

Describes work with pollinia of another Orchis species.

Author:  Thomas Henry Farrer, 1st Baron Farrer
Addressee:  Charles Robert Darwin
Date:  4 June 1868
Classmark:  DAR 164: 42
Letter no:  DCP-LETT-6229
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