suddenly, swept fairly off its legs by some fierce eddy in the stream. Keith heard the negro's guttural cry, and caught a glimpse of him as the two were sent whirling down. The coiled rope of the lariat, grasped in his right hand, was hurled forth like a shot, but came back empty. Not another sound reached him; his own horse went steadily on, feeling his way, until he was nose against the bank, with water merely rippling about his ankles. Keith driving feet again into the stirrups headed him down stream, wading close in toward the shore, leaning forward over the pommel striving to see through the gloom. He had no doubt about Neb's pony making land, unless struck by some driftwood, or borne to the centre of the stream by the shifting force of the current. But if Neb had failed to retain his grip he might have been sucked under by the surge of waters. A hundred yards below he found them, dripping and weak from the struggle, yet otherwise unhurt. There were no words spoken, but black and white hands clasped silently, and then Neb crept back into the saddle, shivering in his wet clothes as the cool night wind swept against him. Keeping close in toward shore, yet far enough out so that the water would hide their trail, the fugitives toiled steadily up stream, guided only by the black outline of the low bank upon their left. Chapter VII. In the Sand Desert Suddenly Keith halted, bringing his pony's head sharply about, so that the two faced one another. The wind was rising, hurling clouds of sand into their eyes, and the plainsman held one hand before his face. “There's no need of keeping up a water trail any longer,” he said quietly. “By all the signs we're in for a sand storm by daylight, and that will cover our tracks so the devil himself couldn't follow them. Got a water bag on your saddle?” “I reck'n dis am one, sah.” Keith felt of the object Neb held forth. “Yes, and a big one, too; fill it and strap it on tight; we've got a long, dry ride ahead.” “Whar' yo' propose goin', Massa Jack?”