“These pioneers of the byways were limited, not by lack of enterprise, but by lack of modern equipment and the technique for its use; both of these required assets came to Yosemite in 1933. A year before that a Rock-Climbing Section was formed in the Sierra Club, and its members brought Alpine technique, which they had practiced and improved in local metropolitan rock parks, to Yosemite. Skillfully using rope and piton technique, and developing their balance climbing to a point where they are able to ascend Half Dome without recourse to any artificial aids, much less cableways, members of this and similar sections, men and women alike, have pioneered many new routes on the valley walls, some extremely difficult. The present total of routes to the rim, exclusive of the trails, is forty-five. Spires and pinnacles not accessible by other means were especially challenging. The higher and lower Cathedral Spires were climbed in 1934 by the party of Jules M. Eichorn, Richard M. Leonard, and Bestor Robinson. The routes for this and other climbs are described in the Yosemite Valley section of a comprehensive ‘Climber’s Guide to the High Sierra,’ being published serially by the Sierra Club. [Illustration: _By D. R. Brower_ Ski Mountaineering Party near Mount Starr King] [Illustration: _By D. R. Brower_ Climbing on the Three Brothers] [Illustration: _By R. M. Leonard_ Descending Lower Cathedral Spire] “Construed at present as the ultimate in technical rock-climbing was the ascent, September 2, 1946, of the Lost Arrow by the party of Jack Arnold, Robin Hansen, Fritz Lippmann, and Anton Nelson. The party used more than a thousand feet of rope and many pounds of mountaineer’s hardware. They first managed to throw a light line over the summit. Two men remained in support at the rim. The other two went down a rope to the notch separating the pinnacle from the valley wall, and with expert technique were able to climb 100 feet of the rock’s outer face, nearly 3,000 sheer feet above the valley floor, until they could reach the lower end of the line. With this they pulled rope over the summit. Another 100 feet of climbing on that rope, with help from the men on the rim, brought them to the top on the evening of the third day. On the crowded, rounded summit they drilled small holes for two expansion bolts, anchored ropes to them, and in the moonlight worked across the gap to the rim on the airy, swinging ropes.