The gorge turning southward, we rounded a sort of mountain promontory, which, closing the view behind us, shut us up in the bottom of a perfect basin. In front lay a placid lake reflecting the intense black-blue of the sky. Granite, stained with purple and red, sank into it upon one side, and a broad spotless field of snow came down to its margin on the other. From a pile of large granite blocks, forty or fifty feet up above the lake margin, we could look down fully a hundred feet through the transparent water to where boulders and pebbles were strewn upon the stone bottom. We had now reached the base of Mount Brewer and were skirting its southern spurs in a wide open corridor surrounded in all directions by lofty granite crags from two to four thousand feet high; above the limits of vegetation, rocks, lakes of deep heavenly blue, and white trackless snows were grouped closely about us. Two sounds, a sharp little cry of martens and occasional heavy crashes of falling rock, saluted us. Climbing became exceedingly difficult, light air--for we had already reached 12,500 feet--beginning to tell on our lungs to such an extent that my friend, who had taken turns with me in carrying my pack, was unable to do so any longer, and I adjusted it to my own shoulders for the rest of the day. After four hours of slow laborious work we made the base of the debris slope which rose about a thousand feet to a saddle pass in the western mountain wall, that range upon which Mount Brewer is so prominent a point. We were nearly an hour in toiling up this slope over an uncertain footing which gave way at almost every step. At last, when almost at the top, we paused to take breath, and then all walked out upon the crest, laid off our packs, and sat down together upon the summit of the ridge, and for a few minutes not a word was spoken. The Sierras are here two parallel summit ranges. We were upon the crest of the western range, and looked down into a gulf 5,000 feet deep, sinking from our feet in abrupt cliffs nearly or quite 2,000 feet, whose base plunged into a broad field of snow lying steep and smooth for a great distance, but broken near its foot by craggy steps often a thousand feet high. Vague blue haze obscured the lost depths, hiding details, giving a bottomless distance out of which, like the breath of wind, floated up a faint treble, vibrating upon the senses, yet never clearly heard.