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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
From:
Karl Heinrich Hermann (Hermann) Hoffmann
To:
Charles Robert Darwin
Date:
17 Apr 1871
Source of text:
DAR 166: 229
Summary:

Comments on Descent.

Reports a case of protective coloration of bugs on Tilia

and observations on frogs fighting [see Descent, 2d ed., pp. 281, 350].

Encloses drawings of chicken feet.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Karl Heinrich Hermann (Hermann) Hoffmann
Date:
20 Apr [1871]
Source of text:
DAR 145: 133
Summary:

Obliged for letter about dog.

Comments on HH’s article ["Zur Geschlechtsbestimmung", Bot. Ztg. 29 (1871): 81–9, 97–109].

Contributor:
Darwin Correspondence Project
From:
Karl Heinrich Hermann (Hermann) Hoffmann
To:
Charles Robert Darwin
Date:
10 Jan 1876
Source of text:
DAR 166: 230
Summary:

Bug on Tilia, cited in Variation, was Cimex apterus.

Contributor:
Darwin Correspondence Project
From:
Karl Heinrich Hermann (Hermann) Hoffmann
To:
Charles Robert Darwin
Date:
4 July 1877
Source of text:
DAR 166: 231
Summary:

Reports monstrous Papaver hybridum not mentioned in M. T. Masters’ Teratology [1869].

Contributor:
Darwin Correspondence Project