Fleeting glimpses they had of the glistening spokes of symmetrical spiders'-webs, whose least thread it would have been beyond the power of the strongest of the tribe to break. They passed through a forest of puff-balls, which boomed when touched and shot a puff of vapor from their open mouths. Once they saw a long and sinuous insect that fled before them and disappeared into a burrow in the ground, running with incredible speed upon legs of uncountable number. It was a centipede all of thirty feet in length, and when they crossed the path it had followed a horrible stench came to their nostrils so that they hurried on. Long escape from unguessed dangers brought boldness, of a sort, to the pink-skinned men, and they would have rested. They went to Burl with their complaint, and he simply pointed with his hands behind them. There were three little clouds of brownish vapor in the air, where they could see, along the road they had traversed. To the right of them a dust-cloud was just settling, and to the left another rose as they looked. A new trick of the deadly dust became apparent now. Toward the end of a day in which they had traveled a long distance, one of the little children ran a little to the left of the route its elders were following. The earth had taken on a brownish hue, and the child stirred up the surface mould with its feet. The brownish dust that had settled there was raised again, and the child ran, crying and choking, to its mother, its lungs burning as with fire, and its eyes like hot coals. Another day would pass before the child could walk. In a strange country, knowing nothing of the dangers that might assail the tribe while waiting for the child to recover, Burl looked about for a hiding-place. Far over to the right a low cliff, perhaps twenty or thirty feet high, showed sides of crumbling, yellow clay, and from where Burl stood he could see the dark openings of burrows scattered here and there upon its face. He watched for a time, to see if any bee or wasp inhabited them, knowing that many kinds of both insects dig burrows for their young, and do not occupy them themselves. No dark forms appeared, however, and he led his people toward the openings. The appearance of the holes confirmed his surmise. They had been dug months before by mining bees, and the entrances were "weathered" and worn. The tribefolk made their way into the three-foot tunnels, and hid themselves, seizing the opportunity to gorge themselves upon the food they carried. Burl stationed himself near the outer end of one of the little caves to watch for signs of danger. While waiting he poked curiously with his spear at a little pile of white and sticky parchment-like stuff he saw just within the mouth of the tunnel.