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Darwin Correspondence Project

From W. E. Darwin   [3 March 1872]1


My dear Father,

I send you the dirt residue from Chalk as Prof. Forbes would probably be able to judge whether this is the result of soakage.2

Parsons weighed them when quite dry, & he is a good chemist; He says B. gets wet from having traces of Chloride of Calcium.3

Your affect | W E D


The date is established by the relationship between this letter and the letter to W. E. Darwin, [1 March 1872]. The first Sunday after 1 March 1872 was 3 March.
William refers to Robert Mann Parsons. See letter from W. E. Darwin, [29 February 1872], and letter to W. E. Darwin, [1 March 1872]. B: presumably the samples of dirt residue were labelled A and B. Calcium chloride is hygroscopic.


Sends dirt residue of chalk samples for David Forbes to examine.

Letter details

Letter no.
William Erasmus Darwin
Charles Robert Darwin
Sent from
Source of text
DAR 162: 104
Physical description
ALS 1p

Please cite as

Darwin Correspondence Project, “Letter no. 8220,” accessed on 7 June 2023,

Also published in The Correspondence of Charles Darwin, vol. 20