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Darwin Correspondence Project

To Edward Frankland   16 July [1873]1

Down, | Beckenham, Kent.

July 16. ’73

My dear Sir,

I am truly obliged to you. I dare say that I shall be able to send the fluid from the glands in about a fortnight; but I doubt whether I shall possibly be able to get as much as you seem to require. Since writing it has occurred to me that the viscid secretion perhaps contains some substance analogous to Pepsine; but whether or not you could detect this I know not.— Would the Carb. of Soda render the testing of any such organic matter difficult?2

If I do not hear from you again I will assume that I had better use the Carb. of Soda.

Pray accept my cordial thanks | & believe me | Yours sincerely | Ch. Darwin


The year is established by the relationship between this letter and the letter from Edward Frankland, 15 July 1873.
CD refers to the digestive fluid of Drosera. See letter from Edward Frankland, 15 July 1873.


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.

Letter details

Letter no.
Charles Robert Darwin
Edward Frankland
Sent from
Source of text
The John Rylands Library, The University of Manchester
Physical description

Please cite as

Darwin Correspondence Project, “Letter no. 8980A,” accessed on 22 September 2021,

Also published in The Correspondence of Charles Darwin, vol. 21