To Edward Frankland 12 April 1874
Down, | Beckenham, Kent.
Ap 12. 74
Dear Professor Frankland
I have just found out that the leaves of Drosera can digest all the phosphate of lime out of bones, & they remain clasped over them for an unusual length of time. Now I want much to ascertain whether it is the phosphate of lime or the animal matter in the bones which keeps them so long clasped. Could you therefore be so kind as to give me 2 or 3 grains of pure phosphate of lime with no animal matter or excess of acid. I believe I am right in supposing that it is phosphate and not super-phosphate in bone.1 I have been much delayed in my work on drosera by new editions of other books,—2 & therefore I shall have time & am very anxious to try an experiment suggested by you, namely whether the leaves would serve to test very weak sewage water.3 Somewhat later in the summer I will beg you to aid me in procuring a little of what may be considered weak sewage water, as I am quite ignorant what would be considered weak & how to obtain it. From your former kindness I think that you will excuse my troubling you.
Yours very sincerely | Ch. Darwin
P.S | The acids which you were so kind as to send to Burdon-Sanderson have proved of the greatest use to me, as he finds that all of them with pepsin digest animal matter.4
Footnotes
Bibliography
Coral reefs 2d ed.: The structure and distribution of coral reefs. By Charles Darwin. Revised edition. London: Smith, Elder & Co. 1874.
Correspondence: The correspondence of Charles Darwin. Edited by Frederick Burkhardt et al. 29 vols to date. Cambridge: Cambridge University Press. 1985–.
Descent 2d ed.: The descent of man, and selection in relation to sex. By Charles Darwin. 2d edition. London: John Murray. 1874.
Insectivorous plants. By Charles Darwin. London: John Murray. 1875.
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.
Letter details
- Letter no.
- DCP-LETT-9405A
- From
- Charles Robert Darwin
- To
- Edward Frankland
- Sent from
- Down
- Source of text
- The John Rylands Library, The University of Manchester
- Physical description
- LS 3pp
Please cite as
Darwin Correspondence Project, “Letter no. 9405A,” accessed on 19 March 2024, https://www.darwinproject.ac.uk/letter/?docId=letters/DCP-LETT-9405A.xml
Also published in The Correspondence of Charles Darwin, vol. 22