“Yes, I do. Take the glass, Barney, and tell me what that object is against that part of an extinct crater over there. Would you not call it a building?” Barney took the glass and studied the object. None had keener or clearer vision than the Celt, and he said presently: “Ye’re roight, Misther Frank. It’s a buildin’, an’ shure it’s made av stone an’ a roof of fir boughs. Shure there’s a wide clearing about it, and on three sides at least there is a steep descint, bejabers, which no man livin’ cud iver cloimb.” “I thought so,” declared Frank, with gratification; “that will do, Barney.” The Irishman handed Frank the glass. The young inventor was just about to view the distant buildings again when a startled yell came from Pomp. “Massy sabe us!” cried the terrified darky. “We’se all goin’ to kingdom come dis berry minute. Look out fo’ dat big stun, Marse Frank--look out, everybody!” Frank at that moment saw with horror what had caused Pomp’s cry. CHAPTER VI. SILVER SAM RETURNS. Engrossed in contemplation of the distant crater Barney and Frank had not heeded things in the near vicinity. But Pomp, chancing to glance up the mountain side, saw a thrilling sight. High up above their position was a mighty bowlder of many tons weight. And back of it he saw the forms of several men. They were trying hard to start the huge bowlder from its place. Their purpose was quite plain. The bowlder started on its career down the mountain, unless swerved in its course, would strike the Steam Man. If struck by the tremendous weight little would be left of the machine. “Golly sakes, Marse Frank!” cried Pomp, in utter horror. “Jus’ yo’ see dat trick of de greasers.” Frank did see it and for a moment was overwhelmed with horror. Then he acted quickly. “Give them a shot, boys!” he cried to Barney and Pomp, as he sprung to the dasher of the wagon. The two servitors quickly obeyed. The big stone was just tottering as their rifles cracked. Several of the greasers were exposed and two of them fell. Crack--ack! Again the rifles spoke. This time two more fell. But the big bowlder was coming. Frank meanwhile had seized the brake and turned the Steam Man’s course to the right. He was not a moment too soon. Down came the big stone like a whirlwind. The Steam Man escaped by the merest hair’s breadth. The stone passed so close to the cage that the wind nearly took Barney’s breath away, he being on that side. “Whurroo!” yelled the Irishman. “I niver see the bate av’ that. Jist about the toime the stone got here shure it looked to be the soize av’ a mountain.” “Golly, youse right dar, I’ish,” cried Pomp. But Frank had started the Steam Man right up the mountain side. It was his purpose to rout the greasers out of their position. But when he reached the spot they were not in sight.