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on letterhead: Pen Sentinel Hotel, A. C. BLACK, Proprietor. Yo Semite Valley 187 coincide 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 axis CAD 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 side A 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.