darkness to warn the unsuspecting engineer of his peril? How easily one of those concealed villains could have tumbled both his friends out of their saddles with a shot from a revolver! And what had prevented them, when the boys first started away, from throwing from the top of the bluff an obstruction upon the track that would have sent both the wheelmen to the ground? No doubt it was because Roy and his friends acted with so much promptness that they did not have time to think of it; but hadn't they had plenty of time since then to recover from their surprise and plan vengeance? This fear almost unnerved Roy. He took one step toward his wheel, but the thought that passed through his mind was driven out as quickly as it came. Come what might, he would not desert his post. He would stay there and warn the train, if one of his companions did not succeed in doing it, and in the mean time if those scoundrels wanted a fight, they could have it.
Roy's first care was to put his lamp behind the rock out of sight, and his second to pull his bicycle case off his shoulder and take out
