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Darwin Correspondence Project

To Leonard Rudd   18 April [1874]1

Down, | Beckenham, Kent.

Ap. 18th

Dear Sir

I am much obliged to your kindness for communicating to me the case of additional mammæ.2 This very interesting abnormality does not seem very rare, if I may judge from the number of cases sent to me.3 The statement of the mammæ enlarging every month is quite new; but I do not understand its meaning, for I do not gather that this commonly occurs with women.—

With my best thanks, Dear Sir | Yours faithfully | Ch. Darwin


The year is established by the relationship between this letter and the letter from Leonard Rudd, 12 April 1874.
For reported cases of supernumerary mammae, see Correspondence vol. 19, letter from James Crichton-Browne, 19 February 1871, and letter from R. H. Tiddeman, 23 March 1871. CD also mentioned additional cases in Descent 2d ed., p. 36 n. 38.


Correspondence: The correspondence of Charles Darwin. Edited by Frederick Burkhardt et al. 27 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.


Discusses LR’s communication concerning supernumerary mammae.

Letter details

Letter no.
Charles Robert Darwin
Leonard Rudd
Sent from
Source of text
American Philosophical Society (Mss.B.D25.441)
Physical description

Please cite as

Darwin Correspondence Project, “Letter no. 9416,” accessed on 22 January 2021,

Also published in The Correspondence of Charles Darwin, vol. 22