The last three months had been filled with toil, hardships, and adventure. Although in that time they saw no white men, nor men of any kind beyond catching occasional glimpses of the stealthy Apaches, who hung on their trail for weeks, and with whom they exchanged more than one rifle-shot, they were never without evidences that this whole vast country had once been occupied by a mighty people. Hardly a day passed that Glen did not hold his rod on the ruined foundation-wall of some huge structure of long ago, or stumble over heaps of broken pottery graceful in form and design, or gaze wonderingly at the stone houses of ancient cliff-dwellers perched on ledges now inaccessible, or walk in the dry beds of crumbling aqueducts, or select choice specimens from piles of warlike implements fashioned from shining crystal or milk-white quartz, or, in some way, have his attention called to the fact that he was traversing a country in which had dwelt millions of his kind, who had long since passed away and been forgotten. He had puzzled over miles of hieroglyphic inscriptions and rude pictures, drawn on the smooth black walls of rugged cañons, and learned from them fragmentary tales of ancient battles or of encounters with savage beasts.