Archie Graham had uttered a cry of dismay--of discovery, too, it seemed to Ralph. The young engineer glanced at his friend perched on the top of the tender tank. The face of the young inventor was a study. Archie acted less like a person startled than as one surprised. He appeared to be neither shocked nor particularly interested. His expression was that of one disappointed. It suddenly flashed across Ralph, he could scarcely have told why, that the young inventor had indeed been "inventing" something, that something had slipped a cog, and that he was responsible for the catastrophe of the moment. Now Archie looked about him in a stealthy, baffled way, as though he was anxious to sneak away from the scene. Half-blinded, sputtering and a sight, "his ludship" struggled out of the grasp of the fireman. His monocle was gone. His face, divested of its hirsute appendages, Ralph observed, was a decidedly evil face. As the train came to a halt the dismantled passenger stepped from the cab, and wrathfully tearing the remaining false whiskers from place, sneaked down the tracks, seeking cover from his discomfiture. "Hi! you've left that nobleman face of yours behind you," shouted Fogg after him. "What's his game, Fairbanks?" "It staggers me," confessed Ralph. "Hello, there, Graham!" But the young inventor with due haste was disappearing over the rear of the tender, as though he was ashamed of a part in the puzzling occurrence at the moment. "Something's wrong," muttered Fogg, and he opened the furnace door timidly. There was no further outburst of ashes. "Queer," he commented. "It couldn't have been powder. I noticed a draft soon as we started. What made it? Where is it now?" "It was only when we were running fast," submitted Ralph. The fireman leaped down to the tracks. He inspected the locomotive from end to end. Then he began ferretting under the engine. Ralph watched him climb between the drivers. Strange, muffled mutterings announced some discovery. In a moment or two Fogg crawled out again. "I vum!" he shouted. "What is this contraption?" He grasped a piece of wire-netted belting, and as he trailed out its other end, to it was attached a queer-looking device that resembled a bellows. Its frame was of iron, and it had a tube with a steel nozzle. "I say," observed the young engineer, in a speculative tone, "where did that come from?" "I found its nozzle end stuck in through one end of the draft holes in the fire box," answered Fogg. "This belt ran around two axles and worked it. Who put it there?" "Graham," announced Ralph politely. "Well--well--I understand his queer actions now. Bring it up here," continued Ralph, as the fireman was about to throw it aside.