To A. C. Ramsay 7 April 
Down Farnborough Kent
Would you be so kind as to inform me, as you will probably know, or perhaps would be so good as to look at the Ordnance Maps, what is the height of Moel Tryfan in Carenarvonshire situated in a line nearly between Snowdon & Caernarvon.1 This hill has been repeatedly mentioned, since Mr Trimmers important discovery2 & no two authors give the same height: in my notice on this hill, I give a very much less height than others & I cannot for the life of me remember on what authority, though I know I took some pains to ascertain.3 I shd be very much obliged for an answer pretty soon, if you can so far oblige me.
Yours sincerely | C. Darwin
Asks ACR to establish height of Moel Tryfan in Caernarvonshire; "in my notice on this hill [""Ancient glaciers of Caernarvonshire"" (1842), Collected papers 1: 163–71] I give a very much less height than others". [See also another mention of the elevation of Moel Tryfan in "On the transportal of erratic boulders" (1848), Collected papers 1: 218–27.]
Please cite as
Darwin Correspondence Project, “Letter no. 1168,” accessed on 12 February 2016, http://www.darwinproject.ac.uk/DCP-LETT-1168