Suddenly Constans bethought himself of that indefinite twinkle of fire, and he trained his broken binoculars on the spot where he had marked it down the night before. The glass disclosed the existence of a comparatively open space, doubtless one of the public squares of the ancient city. It was bordered by a number of handsome edifices, and one unusually large, cream-colored building, whose distinctive architectural feature was a tower of remarkably graceful proportions, attracted Constans's attention; it should serve him for a landmark, and he took its bearings carefully. Breakfast of brown bread and cold smoked beef was a simple and expeditious meal, and, with his appetite appeased, Constans descended to the street. He had his general direction in mind, and so was able to proceed at once upon his journey of exploration, keeping as closely as possible due north. He found the sidewalks and roadway encumbered by rubbish, and here and there almost entirely blocked by fallen masonry; but in spite of these obstructions he managed to maintain a fair average pace. Indeed, it was the strangeness of his surroundings rather than the material obstacles that caused his steps to loiter. The glimpses that he got through the windows of the deserted shops amazed him; a hundred times he would fain have halted to investigate some fresh marvel. But he withstood the temptation, telling himself that these things were but trifles, and that the real objects of his quest lay farther on. An hour's walk brought Constans to within three blocks of the building with the tower. He had purposely diverged from the direct line in approaching it, being shrewdly of the opinion that the stronghold of the Doomsmen was not far distant. He was convinced of the truth of this conjecture when he reached the next cross-street, which debouched into the public square already mentioned. He could see that the end of the street was filled by a barricade of paving-blocks and flag-stones torn up from the roadway; it looked as though the whole square were one vast and formidable fortress. It was still early in the morning, and up to this time Constans had not seen sign of man. Now, as he continued his cautious examination of the barrier, he noticed two or three spirals of smoke rising behind the parapet and going straight up into the windless air. The hornets were stirring then, and it behooved him to keep well away from their nest. After some consideration Constans decided that he would continue on towards the north, skirting this centre of danger at a safe distance until he should be some distance above it. He would then work cautiously back towards the citadel, finally seeking some elevated point, such as the roof of a tall building, from which to complete his observations.