His voice choked, and only his feverishly burning eyes could say the rest. It was well past sunset ere the youngsters set forth from the rendezvous, accompanied a short distance by both Waldo and the professor; but the parting came in good time. It would be worse than folly to add to the existent perils that of possible discovery by some prowling Aztec who might work serious injury to them one and all. That great bear-hide proved a tax upon their strength, even though the bullet-riddled head-piece had been carefully cut off and buried, lest those queer holes tell a risky tale on close examination; but Ixtli, as well as Bruno, was upborne by an exaltation such as neither had known before this hour. There was nothing worse than the natural obstacles in the way to be overcome, and, knowing every square yard of ground so thoroughly, Ixtli chose the most practicable route to that hill-encircled town. The stony pass was followed to the lower level, and the young adventurers had drawn fairly near the first buildings ere encountering a living being; and then ample time was given them for meeting the danger. A low-voiced call sounded upon the night air, and Ixtli responded in much the same tone. Bruno, of course, was utterly in the dark as to what was being said, but he still held perfect faith in his copper-hued guide, and left all to the son of Aztotl. The Aztec brave appeared to be explaining his unusually protracted absence, for he proudly displayed the great grizzly pelt, then exhibited the spear-head from which protruded the tooth-marked wood. Like one who was already familiar with the details, Bruno slowly lounged forward a pace or two, then in silence awaited the pleasure of his companion on that night jaunt. Ixtli was not many minutes in shaking off the Indian, and, almost staggering beneath his shaggy burden, moved away as though in haste to rejoin his family circle. Fortunately for the venture, the Aztecans appeared to believe in the maxim of going to bed early, for there were very few individuals astir at that hour, young though the evening still was. And by the clear moonlight which fell athwart the valley, it was no difficult task to catch sight before being seen, where eyes so busy as those of the two young men were concerned. Only once were they forced to make a brief detour in order to escape meeting another redskin, and then a guarded whisper from the lips of the Aztec warned Bruno that they were almost at the teocalli wherein the Children of the Sun made their home and abiding-place. Leaving the grizzly pelt at a corner, for the time being, Ixtli led his white friend up and into the Temple of the Sun, pressing a hand by way of added caution.