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Hoffmann, Hermann in correspondent 
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From:
Karl Heinrich Hermann (Hermann) Hoffmann
To:
Charles Robert Darwin
Date:
23 June 1870
Source of text:
DAR 193: 113–14
Summary:

Sends drawings of the foot of chicken showing swimming membrane.

Contributor:
Darwin Correspondence Project
From:
Karl Heinrich Hermann (Hermann) Hoffmann
To:
Charles Robert Darwin
Date:
8 October 1870
Source of text:
DAR 193: 114
Summary:

Cancelled. Now enclosure to S7695.

Contributor:
Darwin Correspondence Project