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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

To Edward Frankland   9 March [1874]

Summary

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

Author:  Charles Robert Darwin
Addressee:  Edward Frankland
Date:  9 Mar [1874]
Classmark:  The John Rylands Library, The University of Manchester
Letter no:  DCP-LETT-9347A

To Edward Frankland   12 April 1874

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.

Author:  Charles Robert Darwin
Addressee:  Edward Frankland
Date:  12 Apr 1874
Classmark:  The John Rylands Library, The University of Manchester
Letter no:  DCP-LETT-9405A

To Edward Frankland   17 April 1874

Summary

Thanks for the pure phosphate of lime.

Author:  Charles Robert Darwin
Addressee:  Edward Frankland
Date:  17 Apr 1874
Classmark:  The John Rylands Library, The University of Manchester
Letter no:  DCP-LETT-9415A

To Edward Frankland   22 April [1874]

Summary

Requests permission to call briefly to discuss Drosera.

Author:  Charles Robert Darwin
Addressee:  Edward Frankland
Date:  22 Apr [1874]
Classmark:  The John Rylands Library, The University of Manchester
Letter no:  DCP-LETT-9424A

To Edward Frankland   28 April [1874]

Summary

Thanks for letter relating to domesticated bullfinches’ instinctively cutting off cowslips [see 9430]. Suggests observing whether the birds swallow any part of flower or particular parts.

Author:  Charles Robert Darwin
Addressee:  Edward Frankland
Date:  28 Apr [1874]
Classmark:  The John Rylands Library, The University of Manchester
Letter no:  DCP-LETT-9432A

To Edward Frankland   14 May [1874]

Summary

Requests sewage water (and oleic acid) for experiments to determine sensitivity of leaves [of Drosera].

Author:  Charles Robert Darwin
Addressee:  Edward Frankland
Date:  14 May [1874]
Classmark:  The John Rylands Library, The University of Manchester
Letter no:  DCP-LETT-9460A

To Edward Frankland   20 May [1874]

Summary

Thanks for the sewage water and the oleic acid. The former does not seem to act.

Author:  Charles Robert Darwin
Addressee:  Edward Frankland
Date:  20 May [1874]
Classmark:  The John Rylands Library, The University of Manchester
Letter no:  DCP-LETT-9462A

To Edward Frankland   22 July 1874

Summary

Asks for the specific gravity of common phosphate of ammonia.

Author:  Charles Robert Darwin
Addressee:  Edward Frankland
Date:  22 July 1874
Classmark:  The John Rylands Library, The University of Manchester
Letter no:  DCP-LETT-9559A

To Edward Frankland   31 August 1874

Summary

Utricularia catch freshwater Crustaceans, which cannot be digested and rot in the bladders. CD is interested to identify any substance produced in the putrefaction before it is resolved into gases and salts of ammonia. He has reason to believe that the plant absorbs such products.

Author:  Charles Robert Darwin
Addressee:  Edward Frankland
Date:  31 Aug 1874
Classmark:  The John Rylands Library, The University of Manchester
Letter no:  DCP-LETT-9614A

To Edward Frankland   11 October 1874

Summary

Acknowledges the information about the phosphate and about putrefaction. Regrets that there is no knowledge of the conjectured substance. [See 9671.]

Author:  Charles Robert Darwin
Addressee:  Edward Frankland
Date:  11 Oct 1874
Classmark:  The John Rylands Library, The University of Manchester
Letter no:  DCP-LETT-9673A
Document type
letter (43)
Addressee
Correspondent
Darwin, C. R.[X]
Frankland, Edward[X]
Date
1873 (16)
1874 (14)
1875 (1)
1876 (5)
1878 (2)
1879 (2)
1880 (1)
1882 (2)
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