"Just our luck!"Gus Lafee finished wiping his hands and sullenly threw the towel upon the rocks. His attitude was one of deep dejection. The light seemed gone out of the day and the glory from the golden sun. Even the keen mountain air was devoid of relish, and the early morning no longer yielded its customary zest."Just our luck!" Gus repeated, this time avowedly for the edification of another young fellow who was busily engaged in sousing his head in the water of the lake."What are you grumbling about, anyway?" Hazard Van Dorn lifted a soap-rimmed face questioningly. His eyes were shut. "What's our luck?""Look there!" Gus threw a moody glance skyward. "Some duffer's got ahead of us. We've been scooped, that's all!"Hazard opened his eyes, and caught a fleeting glimpse of a white flag waving arrogantly on the edge of a wall of rock nearly a mile above his head. Then his eyes closed with a snap, and his face wrinkled spasmodically. Gus threw him the towel, and uncommiseratingly watched him wipe out the offending soap. He felt too blue himself to take stock in trivialities.Hazard groaned."Does it hurt-much?" Gus queried, coldly, without interest, as if it were no more than his duty to ask after the welfare of his comrade."I guess it does," responded the suffering one."Soap's pretty strong, eh?-Noticed it myself.""'Tisn't the soap. It's-it's that!" He opened his reddened eyes and pointed toward the innocent white little flag. "That's what hurts."Gus Lafee did not reply, but turned away to start the fire and begin cooking breakfast. His disappointment and grief were too deep for anything but silence, and Hazard, who felt likewise, never opened his mouth as he fed the horses, nor once laid his head against their arching necks or passed caressing fingers through their manes. The two boys were blind, also, to the manifold glories of Mirror Lake which reposed at their very feet. Nine times, had they chosen to move along its margin the short distance of a hundred yards, could they have seen the sunrise repeated; nine times, from behind as many successive peaks, could they have seen the great orb rear his blazing rim; and nine times, had they but looked into the waters of the lake, could they have seen the phenomena reflected faithfully and vividly. But all the Titanic grandeur of the scene was lost to them. They had been robbed of the chief pleasure of their trip to Yosemite Valley. They had been frustrated in their long-cherished design upon Half Dome, and hence were rendered disconsolate and blind to the beauties and the wonders of the place.Half Dome rears its ice-scarred head fully five thousand feet above the level floor of Yosemite Valley. In the name itself of this great rock lies an accurate and complete description. Nothing more nor less is it than a cyclopean, rounded dome, split in half as cleanly as an apple that is divided by a knife. It is, perhaps, quite needless to state that but one-half remains, hence its name, the other half having been carried away by the great ice-river in the stormy time of the Glacial Period. In that dim day one of those frigid rivers gouged a mighty channel from out the solid rock. This channel to-day is Yosemite Valley. But to return to the Half Dome. On its northeastern side, by circuitous trails and stiff climbing, one may gain the Saddle. Against the slope of the Dome the Saddle leans like a gigantic slab, and from the top of this slab, one thousand feet in length, curves the great circle to the summit of the Dome. A few degrees too steep for unaided climbing, these one thousand feet defied for years the adventurous spirits who fixed yearning eyes upon the crest above.