How bitterly he blamed himself for being thus caught off his guard! The simplest precaution would have kept him safe, but he had allowed the soft-moccasined red men to slip up on him without placing the slightest difficulty in their path. If ever a boy felt foolish and angry, it was Rob, as his silent captors slid noiselessly as cats into the black mouth of the tunnel of the cave-dwellers. "I'm a fine scout to be caught napping like that," was his thought. But as the redskins bore him into the narrow portal, they were compelled to release one of his hands. Rob took advantage of this to break a shrub, in a way which he knew would indicate as plain as print to any Boy Scout who saw it which way he had been carried off. The next instant they were in the black tunnel. The Indians ran swiftly but noiselessly, bearing in their sinewy arms the powerless boy. Frightened Rob was not. His brain was too busy thinking up some plan of escape for that. His uppermost emotion was impatient anger at his folly. Even a loose rock, placed at the mouth of the passageway, would have been tripped over by the Indians, and thus have given him warning of their coming. Bitterly he blamed himself for his oversight. More bitter still were his thoughts, as his mind reverted to poor Tubby, hanging alone in space, without any means of knowing what had become of Rob, for the shelf, or ledge, on which the sudden drama of his taking off had been enacted, overhung the cliff face as an eyebrow does an eye. On and on traveled the Moquis, almost noiselessly pitter-pattering along the dusty floor of the passage. They skillfully avoided treading on the carcass of the skinned mountain lion, and it was not long before they emerged in the bowl-like valley in which Rob had seen the solitary marksman who had made a sieve of his hat. At the rocky portal the Moquis paused and grunted gutturally, and then started forward on a steady jog-trot once more. "Well, this is a luxurious way of riding," thought Rob, as he reposed in the sort of armchair the arms of the Indians formed, "if the circumstances were different, I wouldn't mind taking a long trip like this." It was so dark in the cup-like valley that the boy could see but little of the country. He only knew they were in the strange depression by noting how the dark walls upreared against the lighter hue of the star-sprinkled sky.