Our last camp was pitched among the crags and forests behind the South Dome,--where the Middle Fork descends through two successive waterfalls, which, in apparent breadth and volume, far surpass Cho-looke, while the loftiest is nearly as high as Po-ho-no. About three miles west of the Domes, the south wall of the Valley is interrupted by a deep _canon_ leading in a nearly southeast direction. Through this _canon_ comes the Middle Fork, and along its banks lies our course to the great "Pi-wi-ack" (senselessly Englished as "Vernal") and the Nevada Falls. For three miles from our camp opposite the Yo-Semite Fall the _canon_ is threaded by a trail practicable for horses. At its termination we dismounted, sent back our animals, and, strapping their loads upon our own shoulders, struck nearly eastward by a path only less rugged than the trackless crags around us. In some places we were compelled to squeeze sideways through a narrow crevice in the rocks, at imminent danger to our burden of blankets and camp-kettles; in others we became quadrupedal, scrambling up acclivities with which the bald main precipice had made but slight compromise. But for our light marching order,--our only dress being knee-boots, hunting-shirt, and trowsers,--it would have been next to impossible to reach our goal at all. But none of us regretted pouring sweat or strained sinews, when, at the end of our last terrible climb, we stood upon the oozy sod which is brightened into eternal emerald by the spray of Pi-wi-ack. Far below our slippery standing steeply sloped the walls of the ragged chasm down which the snowy river charges roaring after its first headlong plunge; an eternal rainbow flung its shimmering arch across the mighty caldron at the base of the fall; and straight before us in one unbroken leap came down Pi-wi-ack from a granite shelf nearly four hundred feet in height and sixty feet in perfectly horizontal width. Some enterprising speculator, who has since ceased to take the original seventy-five cents' toll, a few years ago built a substantial set of rude ladders against the perpendicular wall over which Pi-wi-ack rushes. We found it still standing, and climbed the dizzy height in a shower of spray, so close to the edge of the fall that we could almost wet our hands in its rim. Once at the top, we found that Nature had been as accommodating to the sight-seer as man himself; for the ledge we landed on was a perfect breastwork, built from the receding precipices on either side of the _canon_ to the very crown of the cataract. The weakest nerves need not have trembled, when once within the parapet, on the smooth, flat rampart, and looking down into the tremendous boiling chasm whence we had just climbed.