After passing through Labyrinth and Stillwater canyons the Powell party found themselves at the mouth of Grand River, which entered the main stream in a canyon thirteen hundred feet deep, and they were at the same time in the head of another great gorge, later named Cataract Canyon. Any one who follows their trail will admit the appropriateness of this title. The length is forty-one miles, the walls reach an altitude of twenty-seven hundred feet at the highest, and in some of the bends are so straight as to give an impression of overhanging the spectator's head as he peers aloft from his boat to the sky so far above. At least that was the impression I received. The verticality of the rocks was greater to my eye here than at any other point. For some distance the declivity of the river bed is the sharpest on the whole course, and this with the narrowness of the canyon began to disturb Powell and lead him to fear that some of the stories of impassable falls might be true. Fortunately no insurmountable obstruction was encountered, and they swept triumphantly on through Narrow Canyon and Glen Canyon to the head of Marble, the real beginning of the greatest gorge of all, at the point where Jacob Hamblin crossed a month or two later in the same year, and which to-day is known as Lee Ferry. Now there was before the party the greatest continuous chasm on the globe, Marble-Grand, almost three hundred miles in length as the river flows. Here they met with the hardest work and greatest danger. They became worn out; food grew scarce, for accidents and wetting had reduced too rapidly the original supply. Then it seemed as if they could not proceed, and the men who had been wrecked in Lodore were not reconciled. Another joined them and, discontented, the three refused to attempt a particularly bad rapid. They climbed to the plateau and were killed by the natives not far from Mount Dellenbaugh. The others, nerving themselves for a desperate struggle, passed the bad place, swept on through more, and emerged triumphant the next day, at noon, August 29, 1869, at the mouth of the Grand Wash, and the end of the Grand Canyon. The victory was won—the last problem of the Wilderness was broken! From this point down the river was known. Jacob Hamblin with several others had passed from here by boat to Callville, and thence to the sea Ives had explored as already noted.