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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

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
Document type
letter (10)
Author
Darwin, C. R.[X]
Addressee
Frankland, Edward[X]
Correspondent
Date
1873
07 (3)
09 (3)
10 (3)
11 (1)
letter