"Morning dawned...a trifle sooner than we could have wished, but Professor Brewer and Hoffman had breakfasted before sunrise, and were off with barometer and theodolite upon their shoulders, purposing to ascend our amphitheatre to its head and climb a great pyramidal peak which swelled up against the eastern sky, closing the view in that direction [Mt. Brewer]...
It was twilight of evening, and almost eight o’clock, when they came back to camp, Brewer leading the way, Hoffman following; and as they sat down by our fire without uttering a word, we read upon their faces terrible fatigue. So we hastened to give them supper of coffee and soup, bread and venison, which resulted, after a time, in our getting in return the story of the day. For eight whole hours they had worked up over granite and snow, mounting ridge after ridge, till the summit was made about two o’clock.
These snowy crests bounding our view at the eastward we had all along taken to be the summits of the Sierra, and Brewer had supposed himself to be climbing a dominant peak, from which he might look eastward over Owen’s Valley and out upon leagues of desert. Instead of this, a vast wall of mountains, lifted still higher than his peak, rose beyond a tremendous cañon which lay like a trough between the two parallel ranks of peaks. Hoffman showed us on his sketch-book the profile of this new range, and I instantly recognized the peaks which I had seen from Mariposa, whose great white pile had led me to believe them the highest points of California."
Mountaineering in the Sierra Nevada; Chapter Three "The Ascent of Mt Tyndall, 1864", Clarence King