For the purpose of getting the full purport and significance of this scene, reverse the method adopted before (Stereograph No. 12), and bend your head forward until your eyes are looking directly downward, […]. Do you see that stone immediately below us, and only a few feet off, the one to the left of the gossamer-like plant growing out of its chink? It is the keystone, and it is leaning so far forward that it must surely topple out! If it does will it not unloose the whole foothold, and where shall we go then? It veritably makes one's head swim to gaze down, down those awful cliffs, so high that although the Merced River lies half a mile off it cannot be seen, and only the hither side of the valley, as it slopes up to its northern walls with its terraced roads. […]
From: Charles Quincy Turner, Yosemite Valley Through the Stereoscope, Underwood & Underwood, New York, 1902, pp. 49-50.
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