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 |
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 |
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 |
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 |
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 |
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 |
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 |
From Edward Frankland 15 July 1873
Author: | Edward Frankland |
Addressee: | Charles Robert Darwin |
Date: | 15 July 1873 |
Classmark: | DAR 164: 206 |
Letter no: | DCP-LETT-8979 |
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 |
From Edward Frankland 22 September 1873
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 |
From Edward Frankland 27 September 1873
Author: | Edward Frankland |
Addressee: | Charles Robert Darwin |
Date: | 27 Sept 1873 |
Classmark: | DAR 164: 208 |
Letter no: | DCP-LETT-9076 |
From Edward Frankland 10 October 1873
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 |
From Edward Frankland 16 October 1873
Author: | Edward Frankland |
Addressee: | Charles Robert Darwin |
Date: | 16 Oct 1873 |
Classmark: | DAR 164: 209 |
Letter no: | DCP-LETT-9098 |
letter | (16) |
Darwin, C. R. | (10) |
Frankland, Edward | (6) |
Frankland, Edward | (10) |
Darwin, C. R. | (6) |