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Houghton Library, Harvard University in repository 
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From:
Charles Robert Darwin
To:
Unidentified
Date:
31 Dec [1852-3]
Source of text:
Houghton Library, Harvard University (Autograph File, D)
Summary:

Responds to correspondent’s request for information about shells from the Coquimbo beds in Chile. Difficulty in deciding on age of deposits and species. Notes views of Alcide d’Orbigny.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Unidentified
Date:
9 Oct [1856]
Source of text:
Houghton Library, Harvard University (Autograph File, D)
Summary:

Thanks for offer of Helix for experiment. Asks for assistance. Mentions failure of his own experiment involving Helix pomatia.

Contributor:
Darwin Correspondence Project