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Darwin, C. R. in correspondent 
Frankland, Edward in correspondent 
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From:
Charles Robert Darwin
To:
Edward Frankland
Date:
12 July 1873
Source of text:
The John Rylands Library, The University of Manchester
Summary:

Seeks the assistance of a professional chemist in securing a qualitative analysis of the fluid secreted by the glands of Drosera which have the power of dissolving animal matter out of the bodies of insects. [See 8979.]

Contributor:
Darwin Correspondence Project
From:
Edward Frankland
To:
Charles Robert Darwin
Date:
15 July 1873
Source of text:
DAR 164: 206
Summary:

Sends sodium carbonate for Drosera experiments. Will try to determine what the solvent is.

Contributor:
Darwin Correspondence Project
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From:
Charles Robert Darwin
To:
Edward Frankland
Date:
16 July [1873]
Source of text:
The John Rylands Library, The University of Manchester
Summary:

Thanks EF for his offer of assistance. Could the viscid secretions [in glands of Drosera] contain pepsin? Will the sodium carbonate render the testing of organic matter difficult? [See 8979.] Will send the fluid in a fortnight.

Contributor:
Darwin Correspondence Project
From:
Edward Frankland
To:
Charles Robert Darwin
Date:
17 July 1873
Source of text:
DAR 164: 207
Summary:

Is going to Switzerland, so analysis of Drosera washings will be delayed. Agrees with CD that solvent is probably pepsin.

Contributor:
Darwin Correspondence Project
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From:
Charles Robert Darwin
To:
Edward Frankland
Date:
18 July [1873]
Source of text:
The John Rylands Library, The University of Manchester
Summary:

Agrees to delay sending the fluid [from the glands of Drosera] until early October. Will try suggestion about pepsin. [See 8981.]

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Edward Frankland
Date:
21 Sept [1873]
Source of text:
The John Rylands Library, The University of Manchester
Summary:

Although CD’s experiments with pepsin were unsuccessful, he observed that the glands [of Drosera] as far as acid is concerned act just as the stomach of a mammal. Further experiments detailed. The secretion must contain something analogous to pepsin. [See 9062.]

Contributor:
Darwin Correspondence Project
From:
Edward Frankland
To:
Charles Robert Darwin
Date:
22 Sept 1873
Source of text:
DAR 58.1: 38–9
Summary:

CD’s discovery of acidity of Drosera secretion is interesting. EF explains how hydrochloric acid can be detected and identified. [See Insectivorous plants, p. 88.]

Contributor:
Darwin Correspondence Project
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From:
Charles Robert Darwin
To:
Edward Frankland
Date:
23 Sept 1873
Source of text:
The John Rylands Library, The University of Manchester
Summary:

Will follow EF’s suggestions as to securing purity of fibrin.

Contributor:
Darwin Correspondence Project
From:
Edward Frankland
To:
Charles Robert Darwin
Date:
27 Sept 1873
Source of text:
DAR 164: 208
Summary:

Has sent CD some pure distilled water for his Drosera experiments.

Contributor:
Darwin Correspondence Project
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From:
Charles Robert Darwin
To:
Edward Frankland
Date:
29 Sept 1873
Source of text:
The John Rylands Library, The University of Manchester
Summary:

Is sending washings of 445 leaves in EF’s distilled water with 20 grains of carbonate of soda. Details of the difficulties and complications involved.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Edward Frankland
Date:
7 Oct [1873]
Source of text:
The John Rylands Library, The University of Manchester
Summary:

Requests a piece of the most sensitive litmus paper in order to test the secretions of minute hairs of plants which catch minute flies. [See 9098.]

Contributor:
Darwin Correspondence Project
From:
Edward Frankland
To:
Charles Robert Darwin
Date:
10 Oct 1873
Source of text:
DAR 58.1: 44–6
Summary:

The results of EF’s tests for acids in the secretion of Drosera are largely negative [see Insectivorous plants, p. 88].

Contributor:
Darwin Correspondence Project
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From:
Charles Robert Darwin
To:
Edward Frankland
Date:
13 Oct 1873
Source of text:
The John Rylands Library, The University of Manchester
Summary:

Finds the negative information sent by EF of great interest [see 9094].

More on his own experiments and the perplexing results when using the sensitive litmus paper.

Contributor:
Darwin Correspondence Project
From:
Edward Frankland
To:
Charles Robert Darwin
Date:
16 Oct 1873
Source of text:
DAR 164: 209
Summary:

Sends some litmus paper for CD.

Contributor:
Darwin Correspondence Project
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From:
Charles Robert Darwin
To:
Edward Frankland
Date:
18 Oct [1873]
Source of text:
The John Rylands Library, The University of Manchester
Summary:

Apologises for his ignorance in interpreting the results secured in his testing with blue litmus paper.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Edward Frankland
Date:
[10 Nov 1873]
Source of text:
The John Rylands Library, The University of Manchester
Summary:

Requests permission to call upon EF either Friday or Saturday morning [14 or 15 November].

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Edward Frankland
Date:
9 Mar [1874]
Source of text:
The John Rylands Library, The University of Manchester
Summary:

Requests EF’s vote and support in favour of Henry Parker for membership in the Athenaeum.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Edward Frankland
Date:
12 Apr 1874
Source of text:
The John Rylands Library, The University of Manchester
Summary:

Finding that the leaves of Drosera digest all the phosphate of lime out of bones and then remain clasped over the bones for a long time, CD wants to determine whether it is the phosphate of lime or the animal matter in the bones that keeps them clasped. He asks EF to send 2 or 3 grams of pure phosphate of lime for his testing. [See 9411.] Will experiment in the summer using EF’s suggestion that leaves might serve to test weak sewage. Results of Sanderson’s experiments with acids of great use.

Contributor:
Darwin Correspondence Project
From:
Edward Frankland
To:
Charles Robert Darwin
Date:
15 Apr 1874
Source of text:
DAR 58.1: 49–50
Summary:

Sends some phosphates of lime free of animal matter [see Insectivorous plants, p. 109].

Contributor:
Darwin Correspondence Project
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From:
Charles Robert Darwin
To:
Edward Frankland
Date:
17 Apr 1874
Source of text:
The John Rylands Library, The University of Manchester
Summary:

Thanks for the pure phosphate of lime.

Contributor:
Darwin Correspondence Project