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Darwin, C. R. in correspondent 
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From:
Heinrich Ludwig Hermann (Hermann) Müller
To:
Charles Robert Darwin
Date:
19 May 1873
Source of text:
DAR 76: B181–2, DAR 77: 139
Summary:

Praises Expression.

Reports on Fritz Müller’s observations of cross- and self-fertilisation. HM will cultivate the two forms [i.e., mainly self-fertilised and mainly cross-fertilised] in the way CD has described.

He continues his observation of wild flowers. Encloses drawing of Viola tricolor with notes on its self-fertility.

Contributor:
Darwin Correspondence Project
From:
Arthur John Edward (Arthur) Russell, Lord Arthur Russell
To:
Charles Robert Darwin
Date:
19 May 1873
Source of text:
DAR 176: 226
Summary:

In Variation CD claims there are no distinct races of carp, but AR says that in Germany a peculiar and constant variety of carp has been bred.

Contributor:
Darwin Correspondence Project