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Darwin Correspondence Project

From Louis Agassiz   29 September 1863

Cambridge, [Massachusetts]

Sept. 29, 1863

My dear Sir,

Allow me to introduce to you Mr. J. P. Lesley,1 the most accomplished ⁠⟨⁠g⁠⟩⁠eologist of the United States & to take this opportunity to express to you my kindest regards.

Very truly yours | Ls Agassiz

Charles Darwin Esq.


J. Peter Lesley was professor of mining at the University of Pennsylvania. In October 1863 he began a three-month visit to Europe on behalf of the Pennsylvania Railroad Company, in order to study methods of hardening the surface of rails (Ames ed. 1909, 1: 436). Lesley reported having met CD at Charles Lyell’s house in London on 21 October 1863, describing him as ‘a gentle shy person of 55+ years of age’ (ibid. 1: 447). However, Emma Darwin’s diary (DAR 242) makes no reference to CD’s having gone to London on that date, and records that he had a ‘bad day’ with ‘sickness’.


Introduces J. P. Lesley, "the most accomplished geologist of the United States".

Letter details

Letter no.
Jean Louis Rodolphe (Louis) Agassiz
Charles Robert Darwin
Sent from
Cambridge Mass.
Source of text
DAR 159: 9
Physical description
ALS 1p †

Please cite as

Darwin Correspondence Project, “Letter no. 4311,” accessed on 8 December 2022,

Also published in The Correspondence of Charles Darwin, vol. 11