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Rohlfs, Gerhard in correspondent 
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From:
Gerhard Friedrich (Gerhard) Rohlfs
To:
Charles Robert Darwin
Date:
6 June 1871
Source of text:
DAR 89: 183–4
Summary:

Various observations from his experience in Africa relevant to Descent.

Fertility of hybrids of blacks and whites.

Protective coloration of Sahara animals.

Natives’ ideas of female beauty.

Contributor:
Darwin Correspondence Project
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From:
Charles Robert Darwin
To:
Gerhard Friedrich (Gerhard) Rohlfs
Date:
8 June 1871
Source of text:
Universitätsbibliothek Basel, Handschriften (Allgemeine Autographensammlung, D)
Summary:

Thanks GR, who made one of the most wonderful expeditions on record, for some notes which he will consider if he ever has to prepare a new edition [of Descent].

Contributor:
Darwin Correspondence Project