"An' now," said the Little Giant, taking off his hat and looking back, "good-bye trees, good-bye hills, good-bye, high mountains, good-bye all clear, cold streams like this, an' good-bye, you grand White Dome. Say them words after me, young William, 'cause when we git out on the great plains we're likely to miss these friends o' ourn." He spoke with evident feeling, and Will, taking off his hat, said the words after him, though with more regard to grammar. "And now, after leading them most of the way," said Boyd, "we'll ride on the backs of our horses." The four mounted, and, while they regretted the woods and the running water they were about to leave behind them, they were glad to ride once more, and they felt the freedom and exhilaration that would come with the swift, easy motion of their horses. The pack animals, knowing the hands that fed and protected them, would follow with certainty close behind them, and Will, in particular, could lead them as if he had been training them for years. The vast sweep of the plains into which they now emerged showed great natural beauty, that is, to those who loved freedom and space, and the winds came untarnished a thousand miles. Before them stretched the country, not flat, but in swell on swell, tinted a delicate green, and with wild flowers growing in the tufts of grass. "I've roamed over 'em for years," said Brady, "and after a while they take a mighty grip on you. It may be all the stronger for me, because I'm somewhat solitary by nature." "You're shorely not troubled by neighbors out here," said the Little Giant. "I've passed three or four months at a time in the mountings without a soul to speak to but myself. The great West suits a man, who don't want to talk, clean down to the groun'." Will, the reins lying upon the pommel of his saddle, was surveying the horizon with the powerful glasses which he was so proud to possess, and far in the southeast he noticed a dim blur which did not seem to be a natural part of the plain. It grew as he watched it, assuming the shape of a cloud that moved westward along one side of a triangle, while the four were riding along the other side. If they did not veer from their course they would meet, in time, and the cloud, seemingly of dust, was, therefore, a matter of living interest. "What are you looking at so long?" asked Boyd. "A cloud of dust that grows and grows and grows." "Where?" "In the southeast." "I can't see it and I have pretty keen eyes." "The naked eye won't reach so far, but the dust cloud is there just the same. It's moving in a course almost parallel with us and it grows every second I look at it. It may be the dust kicked up by a band of Sioux horsemen. Take a look, Jim, and tell us what you make of it." Boyd looked through the glasses, at first with apprehension that soon changed to satisfaction.