skip to content

Darwin Correspondence Project

From John Provis   14 July 1842


14th. July 1842.


In compliance with your request I now send you the heights of certain parts of the Holyhead Road as shewn on a Section in my possession.1 The heights are figured in feet & decimals, Oswestry for instance being 428 8/10 fee tabove the base line of the Section. The level line of the Section has been taken from the level of the Road opposite the Hotel at Holyhead, and if you add three feet to each of the heights I have sent you, it will bring them nearly to the level of the several places above high water of Spring Tides.

I have omitted the height of the Village of Bethesda as its name is not given on my Section, and I am inclined to think that the name of Bethesda has been given to the place since the Section was taken.

dear Sir | Your very obdt Servant | John Provis Charles Darwin Esqre

CD annotations

Verso of last page, ink, deleted in ink: 16. 5. 1. 0 5. ——– 1[over ‘2’] ’ 19. 11
Top of first page: ‘5’ink


CD sought this information for his article on the evidence for elevation in North Wales (‘Notes on the effects produced by the ancient glaciers of Caernarvonshire’, Collected papers 1: 163–71) published in September 1842.


‘Ancient glaciers of Caernarvonshire’: Notes on the effects produced by the ancient glaciers of Caernarvonshire, and on the boulders transported by floating ice. By Charles Darwin. Philosophical Magazine 3d ser. 21 (1842): 180–8. [Shorter publications, pp. 140–7.]

Collected papers: The collected papers of Charles Darwin. Edited by Paul H. Barrett. 2 vols. Chicago and London: University of Chicago Press. 1977.


Discusses elevations along Holyhead Road [Anglesey].

Letter details

Letter no.
John Provis
Charles Robert Darwin
Sent from
Source of text
DAR 27.1: B23
Physical description
ALS 2pp †

Please cite as

Darwin Correspondence Project, “Letter no. 635,” accessed on 4 June 2023,

Also published in The Correspondence of Charles Darwin, vol. 2