"Then there's water higher up. They're in here yet, Nick, and we'll find 'em. We must keep our eyes and ears peeled, so they can't get the first pop." They picked their way carefully up the canyon, watching the gorge that lengthened beyond them and the walls that towered above their heads, listening constantly for the faintest sounds of human voice or foot, speaking rarely and always in a whisper. The floor of the canyon was strewn with boulders large and small, and its sides rose above them in rugged, barren, precipitous cliffs. Nowhere did they see the slightest sign of vegetation to relieve the wilderness of sand and rock and barren walls. Not even a single grass blade thrust a brave green head between forbidding stones. Above them was a sky of pure, brilliant blue, and around them was the gray of the everlasting granite. Except for the sound of their own footsteps, the canyon was absolutely silent. There was no call of animals one to another, or twitter of birds, or whirr of feathered wings, or piping of insects. Now and then a slender, graceful lizard darted silently out of the sunshine to hide beneath a stone, and far behind them in the canyon the buzzards wheeled in low, awkward flights above the carcass of the dead horse. But aside from these no living creature was to be seen. The sun shone squarely down upon the canyon and the baking heat between its narrow walls would have dazed the brains and shaken the knees of men less hardy and less accustomed to the fierce, pounding sunshine of the southwest. Tuttle stole several inquiring glances at Nick's face. Then he stopped and cast a searching look all about them, carefully scanning the canyon before and behind them and its walls above their heads. He looked at Nick again and then threw another careful glance all about. He coughed a little, came close to Nick's side, wiped the sweat from his face, and finally spoke, hesitatingly, in a half whisper: "Say, Nick, what do you-all think about Will Whittaker? Do you reckon Emerson killed him?" Ellhorn shut one eye at the jagged peak which seemed to bore into the blue above them, considered a moment, and replied: "Well, I reckon if he did Will needed killin' almighty bad." "You bet he did," was Tom's emphatic response.