The professor carried with him a small volume containing a partial translation of the symbols and sign language of the ancient tribe whose domains they were about to invade. Jack had a coil of stout, half-inch manila rope, about two hundred feet in length. Walt Phelps' burden was a shovel, while Ralph Stetson carried an axe. All bore with them their revolvers, and Coyote Pete carried, in addition, a rifle. "Are you afraid of anything?" the professor had asked him, as he noticed the sun-bronzed plainsman pick up this latter weapon. "Waal," Pete had rejoined, with a portentous wink at the boys, "you never kin tell in this wale of tears what you're a-goin' up aginst--queer shapes, fer instance." As they strode along, naturally the subject of the shadowy forms which had alarmed them the night before arose. Jack would have liked to investigate them right then and there, but, after all, he decided with the rest of the party, that an exploration of the mesa was the first thing of importance to be accomplished. And an interesting sight the great abandoned aboriginal beehive, was, as they rounded the inaccessible side and emerged upon the portion which faced toward the northwest. Pete's recollection had not played him false. There was a rough pathway constructed up its face upon this side, and at the top were three tiers of holes bored in the rock face. These were evidently intended for windows, as a larger aperture was just as evidently meant for a door. The path, which zig-zagged up the face of the mesa was about eight inches in width, not more, at its base, and varied--so far as they could see from below--from that breadth to a foot, as it grew higher. From the base to the summit the mesa was probably about one hundred and fifty feet in height, the windows not commencing till within twenty feet of the top. Its length at the base was, roughly, three hundred feet, and its thickness varied from three hundred feet or more at the center, to a few feet at each end. Roughly, then, its basic outline was that of an irregular parallelogram, while its profile was that of a flat-topped cone. For some moments the little group stood in silence as they gazed up at the yellowish-gray walls of the once-active mound. Finally, recovering from their reverie, they set out after Coyote Pete to scale the narrow pathway leading to the summit. But, as the cow-puncher set his feet on the lowermost part of the path, he gave an exclamation of astonishment and pointed downward. There in the dust was a footprint,--several of them, in fact. It was a startling discovery in that isolated part of the desert to come upon the traces of human occupancy. Robinson Crusoe on his desert island could not have looked any more astonished at the imprint of the savage's sole, than did Coyote Pete. He stood looking down speechlessly at his discovery, while the others crowded about him, asking a dozen questions at once.