[Joseph] Le Conte
[on letterhead: Pen Sentinel Hotel, A. C. BLACK, Proprietor.] Yo Semite Valley ______________187coincide with the present line of summits but lies to the East ward of them, because the range runs to the West of North & consequently the West side of the range received more heat & the west side glaciers were more wasted in summer & kept smaller than those of the more sheltered eastside, & were not able to do so much denudation work, therefore the main axis was overridden after being sharpened to a crest, & the summits gradually pushed westward to their present positions Section 2 [drawing] Geological axisCAD present outline of D The crest of every main cross section of summits & spur summit out of sun balance has been pushed thus to the warmer sideA B Line of successive glacier-made summits gradually driven from axis westward[in margin: Besides these at 33° E lines there are others which we will see & study hereafter. I have a thought or two & some facts [illegible] glacial flora of this region [illegible] you call attention, come for writing is discouraging with such truths. Cordially yrs John Muir By summits I mean any mountain [wave?] sufficiently high for glacier fountains.]
1872 Apr 20
Original letter dimensions unknown.
Reel 02, Image 0777
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