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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
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Darwin, C. R. (5)
Frankland, Edwarddisabled_by_default