Search: 1860-1869 in date 
Tristram, H. B. in addressee 
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From:
Charles Robert Darwin
To:
Henry Baker Tristram
Date:
4 June 1868
Source of text:
Private collection
Summary:

Asks about camouflage of birds in the Sahara desert.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Henry Baker Tristram
Date:
4 July 1868
Source of text:
The British Library (Surrogate RP 9485)
Summary:

Thanks for interesting letter. ‘How very curious the case of the bright-coloured birds which conceal themselves in holes!’

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Henry Baker Tristram
Date:
8 Sept 1868
Source of text:
The British Library (Surrogate RP 9485)
Summary:

Thanks for answers to questions, but declines loan of specimens.

Contributor:
Darwin Correspondence Project