During the next few days, while they were ascending the comparatively narrow valley of Klukshu River, a small stream emptying into the Alsek above Dalton's Post, winter made his last dying effort. It was now the middle of April, and the sun was so high that the snow softened greatly at midday. It had become impossible to make satisfactory progress except by rising at two o'clock in the morning and starting as soon as there was light. For three successive nights the mercury sank to zero, and the air was so keen and frosty that their fingers were nearly frozen when, in the early dawn-light, they removed their mittens to loosen the knots of the tent-ropes; yet by noon it was invariably so warm that the snow was melting and the sleds stuck fast. The Klukshu River was not so thoroughly ice-bound as the Alsek, and, already swollen with the melting snows, it had broken its fetters in many places, so that it was impossible to follow the stream itself. Twice, however, the trail crossed it,--first from west to east by a jam of tree-trunks and débris, and then back again by a narrow span of ice which cracked ominously and threatened to go down-stream, even as they passed over it. Here they met Grant Baldwin, Al King's partner,--a young man not much older than David, who was travelling alone to the coast with a sled drawn by two dogs. At length, after many a tussle with hills and willow thickets and stumps and roots and ruts, all of which seemed in league to oppose them, the Bradfords reached the lower end of Klukshu Lake, a long but narrow body of water at the eastern side of a broad valley. Except a small spot near the outlet, it was covered with ice and snow. Four miles to the west among others rose a peak so perfectly conical as to serve for an excellent landmark, while to the northwest and ten miles away they could see the extensive mountain system in which lay Al King's claim. Uncle Will at once examined the cache which he had left in the deserted Indian shack. Finding it intact and in good condition, he determined to keep it there for the present, and the whole party pushed on up the lake, which proved to be about four miles long, curving to the east at its upper end. Here a long hill was surmounted in the same manner as at the Stik village, after which a trail through the woods brought them over a divide to a larger lake called Dasar-dee-ash, whose outlet, in contrast to that of Klukshu, flowed from the northern end. This lake was solidly frozen as far as the eye could see, its surface being a succession of snowy windrows separated by streaks of ice. The grand mountain chain which they had seen in the distance rose from its western edge, while the opposite shore sloped gently back in wooded hills. Mr. Bradford estimated that the lake was fifteen miles long, and about twelve broad at its widest part.