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Crocker, C. W. in correspondent 
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From:
Charles Robert Darwin
To:
Charles William Crocker
Date:
18 May [1861]
Source of text:
Cleveland Health Sciences Library (Robert M. Stecher collection)
Summary:

Describes results of his experiments with hollyhocks. Some varieties breed true even though growing near others. This suggests that their pollen is "pre-potent" over that of other varieties, which is not the case with most plants. Asks some questions on which he would be glad to have correspondent work. [See also 3170.]

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Charles William Crocker
Date:
1 June [1861]
Source of text:
American Philosophical Society (Mss.B.D25.251)
Summary:

Suggests procedures for breeding experiments with hollyhocks. Recommends C. F. v. Gärtner [Bastarderzeugung (1849)]. [See also 3151]

Contributor:
Darwin Correspondence Project
From:
Charles William Crocker
To:
Charles Robert Darwin
Date:
17 Feb 1862
Source of text:
DAR 161.2: 254
Summary:

Thanks for Primula paper [Collected papers 2: 45–63].

Separation of sexes in Billbergia.

Offers to experiment under CD’s direction, now that he has retired from Kew.

Contributor:
Darwin Correspondence Project
From:
Charles William Crocker
To:
Charles Robert Darwin
Date:
[before 13 Mar 1862]
Source of text:
DAR 161.2: 255
Summary:

Will experiment on hollyhocks as CD suggests.

On desirability of a place for experiments to be set up by Government or a scientific society. Kew is too busy for experiments.

Contributor:
Darwin Correspondence Project
From:
Charles William Crocker
To:
Charles Robert Darwin
Date:
13 Mar 1862
Source of text:
DAR 161.2: 256
Summary:

Informs CD where, at Kew, to find Epipactis palustris.

Has never trusted Donald Beaton.

Contributor:
Darwin Correspondence Project
From:
Charles William Crocker
To:
Charles Robert Darwin
Date:
22 Apr 1862
Source of text:
DAR 161.2: 257
Summary:

Certain there are three forms of Primula sinensis.

Contributor:
Darwin Correspondence Project
From:
Charles William Crocker
To:
Charles Robert Darwin
Date:
17 May 1862
Source of text:
DAR 108: 133, DAR 161.2: 258
Summary:

Comments on presentation copy of Orchids. Has CD studied the orchid Sobralia?

Cannot get material for hollyhock experiment.

Sends his notes on Primula sinensis.

He is experimenting on Ranunculus.

Contributor:
Darwin Correspondence Project
From:
Charles William Crocker
To:
Charles Robert Darwin
Date:
31 Oct 1862
Source of text:
DAR 76 (ser. 2): 84a–d
Summary:

Difficulties in beginning experiments upon retirement.

Describes his observations on insect pollination of Antirrhinum and the effect of excluding the pollinators.

Has been observing variant forms of Plantago

and comparing local orchids with CD’s observations.

Possibility of an intermediate-styled primrose.

His experiments at Kew and J. B. Lawes’s at Harpenden on deterioration of vegetables and cereals.

Contributor:
Darwin Correspondence Project
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From:
Charles William Crocker
To:
Charles Robert Darwin
Date:
24 Nov 1862
Source of text:
DAR 161.2: 259
Summary:

Answers on Begonia.

Snapdragon crossing experiments.

Thanks for offer of plants.

Contributor:
Darwin Correspondence Project
From:
Charles William Crocker
To:
Charles Robert Darwin
Date:
1[–4] May 1863
Source of text:
DAR 110: 28, DAR 161: 260
Summary:

Observes Plantago’s out-crossing mechanism.

Observations of style lengths of primroses and cowslips.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Charles William Crocker
Date:
31 Jan [1864]
Source of text:
Cleveland Health Sciences Library (Robert M. Stecher collection)
Summary:

Reminds CWC that he offered to give information with respect to his observations on hollyhocks. Wishes he could persuade CWC to undertake experiments on the fertility of some crosses between the most distinct varieties.

Contributor:
Darwin Correspondence Project