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Darwin Correspondence Project

From F. S. B. F. de Chaumont to W. E. Darwin   7 May 1871


May 7th. 1871

My dear Darwin,

I have not forgotten the question about the pupil in the cold stage of ague—1 As I told you we had several cases brought into hospital sometime ago,—but my own duties prevented me seeing them much, so that I only saw one case in which it seemed to me that the pupils were dilated:— but the observation was not worth much as the man was obviously emerging from the cold stage— I however called Dr Fyffe’s att〈e〉ntion to the matter & as he 〈is〉 in charge of the medical 〈r〉ounds he has had better opportunity— He tells me he has been fortunate enough to see two cases in the cold stage well-marked,—and in each case the pupils were distinctly dilated2

Yours v〈er〉y truly | F. de Chaumont

W. E. Darwin Esqr.


William J. Fyffe’s observations were reported in Expression, p. 304, in a discussion of the expression of horror.


Expression: The expression of the emotions in man and animals. By Charles Darwin. London: John Murray. 1872.


The pupils of eyes of ague patients in the cold stage are dilated.

Letter details

Letter no.
Francis Stephen Bennet François de Chaumont
William Erasmus Darwin
Sent from
Source of text
DAR 162: 137
Physical description

Please cite as

Darwin Correspondence Project, “Letter no. 7743,” accessed on 27 February 2021,

Also published in The Correspondence of Charles Darwin, vol. 19