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To Edward Frankland   12 July 1873

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.]

Author:  Charles Robert Darwin
Addressee:  Edward Frankland
Date:  12 July 1873
Classmark:  The John Rylands Library, The University of Manchester
Letter no:  DCP-LETT-8977A

From Edward Frankland   15 July 1873

Summary

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

Author:  Edward Frankland
Addressee:  Charles Robert Darwin
Date:  15 July 1873
Classmark:  DAR 164: 206
Letter no:  DCP-LETT-8979

To Edward Frankland   16 July [1873]

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.

Author:  Charles Robert Darwin
Addressee:  Edward Frankland
Date:  16 July [1873]
Classmark:  The John Rylands Library, The University of Manchester
Letter no:  DCP-LETT-8980A

From Edward Frankland   17 July 1873

Summary

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

Author:  Edward Frankland
Addressee:  Charles Robert Darwin
Date:  17 July 1873
Classmark:  DAR 164: 207
Letter no:  DCP-LETT-8981

To Edward Frankland   18 July [1873]

Summary

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

Author:  Charles Robert Darwin
Addressee:  Edward Frankland
Date:  18 July [1873]
Classmark:  The John Rylands Library, The University of Manchester
Letter no:  DCP-LETT-8982A

To Edward Frankland   21 September [1873]

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.]

Author:  Charles Robert Darwin
Addressee:  Edward Frankland
Date:  21 Sept [1873]
Classmark:  The John Rylands Library, The University of Manchester
Letter no:  DCP-LETT-9061A

From Edward Frankland   22 September 1873

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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.]

Author:  Edward Frankland
Addressee:  Charles Robert Darwin
Date:  22 Sept 1873
Classmark:  DAR 58.1: 38–9
Letter no:  DCP-LETT-9062

To Edward Frankland   23 September 1873

Summary

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

Author:  Charles Robert Darwin
Addressee:  Edward Frankland
Date:  23 Sept 1873
Classmark:  The John Rylands Library, The University of Manchester
Letter no:  DCP-LETT-9064A

From Edward Frankland   27 September 1873

Summary

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

Author:  Edward Frankland
Addressee:  Charles Robert Darwin
Date:  27 Sept 1873
Classmark:  DAR 164: 208
Letter no:  DCP-LETT-9076

To Edward Frankland   29 September 1873

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.

Author:  Charles Robert Darwin
Addressee:  Edward Frankland
Date:  29 Sept 1873
Classmark:  The John Rylands Library, The University of Manchester
Letter no:  DCP-LETT-9077A

To Edward Frankland   7 October [1873]

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.]

Author:  Charles Robert Darwin
Addressee:  Edward Frankland
Date:  7 Oct [1873]
Classmark:  The John Rylands Library, The University of Manchester
Letter no:  DCP-LETT-9090A

From Edward Frankland   10 October 1873

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Summary

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

Author:  Edward Frankland
Addressee:  Charles Robert Darwin
Date:  10 Oct 1873
Classmark:  DAR 58.1: 44–6
Letter no:  DCP-LETT-9094

To Edward Frankland   13 October 1873

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.

Author:  Charles Robert Darwin
Addressee:  Edward Frankland
Date:  13 Oct 1873
Classmark:  The John Rylands Library, The University of Manchester
Letter no:  DCP-LETT-9096A

From Edward Frankland   16 October 1873

Summary

Sends some litmus paper for CD.

Author:  Edward Frankland
Addressee:  Charles Robert Darwin
Date:  16 Oct 1873
Classmark:  DAR 164: 209
Letter no:  DCP-LETT-9098

To Edward Frankland   18 October [1873]

Summary

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

Author:  Charles Robert Darwin
Addressee:  Edward Frankland
Date:  18 Oct [1873]
Classmark:  The John Rylands Library, The University of Manchester
Letter no:  DCP-LETT-9100A

To Edward Frankland   [10 November 1873]

Summary

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

Author:  Charles Robert Darwin
Addressee:  Edward Frankland
Date:  [10 Nov 1873]
Classmark:  The John Rylands Library, The University of Manchester
Letter no:  DCP-LETT-9137A
Document type
letter (16)
Addressee
Correspondent
Date
1873
07 (5)
09 (5)
10 (5)
11 (1)
letter