Search: Denny, John in correspondent 
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From:
Charles Robert Darwin
To:
John Denny
Date:
9 July 1872
Source of text:
University of Otago Library, Special Collections (DeB MS 55)
Summary:

Has read JD’s articles in the Gardeners’ Chronicle [(1872): 872, 904–5].

Questions him on the fertility of certain varieties of Pelargonium which are fertile with some varieties but infertile with others.

Contributor:
Darwin Correspondence Project
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From:
John Denny
To:
Charles Robert Darwin
Date:
12 July 1872
Source of text:
DAR 162: 159
Summary:

Replies to CD’s queries. Duke of Cornwall Pelargonium is fertile with its own pollen. Has failed to produce hybrids from other varieties besides P. peltatum and P. elegans. Sends numbers of the Florist which contain an account of his mode of procedure ["On cross-breeding pelargoniums" Florist & Pomologist (1872): 10, 34, 50].

Reports a confirmation of his theory of the prepotence of the male parent.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
John Denny
Date:
14 July [1872]
Source of text:
DAR 96: 114–15
Summary:

Discusses JD’s crossing experiments with Pelargonium; notes that his conclusions on male prepotence oppose those of Gärtner. Suggests that his observations on differences in fertility of certain varieties of Pelargonium crossed with certain other varieties be communicated to the Linnean Society.

Contributor:
Darwin Correspondence Project
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From:
John Denny
To:
Charles Robert Darwin
Date:
20 July 1872
Source of text:
DAR 162: 160
Summary:

Thanks CD for his offer to communicate the results of his experiments with Pelargonium to the Linnean Society. Prefers to continue experimenting for at least another season before doing so.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
John Denny
Date:
22 July 1872
Source of text:
University of Otago Library, Special Collections (DeB MS 55)
Summary:

Discusses the mutual sterility of some varieties of Pelargonium.

Contributor:
Darwin Correspondence Project
From:
John Denny
To:
Charles Robert Darwin
Date:
16 Aug 1879
Source of text:
DAR 162: 161
Summary:

JD communicates, after seven years, news of a new "sport" of Pelargonium, sterile both with other varieties and with the mother plant, thus indicating that it is possibly a new species.

Contributor:
Darwin Correspondence Project