"Good," said the conductor, "I hope he'll make it."

With a signal to couple on the engine he hurried away for a final inspection of his train.

For a moment the three persons left behind stood in silence. There was a hiss of the engine as it pushed the connecting blocks together and then those waiting so anxiously could hear the jar of connecting valves as the brake hose were snapped. Confident as Alan was, it gave him a sinking feeling. Then, as the swish of tests sounded and the gnome-like figures of the depot men crawled from under the car, the Major looked again at his watch in despair.

"Four minutes—"

Before he could say more Alan caught sight of a movement among those gathered around the last car at the far end of the depot.

"There he is!" he shouted and darted forward.

"He sho'ly is," exclaimed Elmer, his white teeth showing, "and Yar's de screw driver and yar's de screws all ready."

A slowly moving truck had carefully turned the end of the waiting train and, drawn by two baggage-room employees, was making its way along the platform. By its side walked a boy—a lad of about seventeen. One of his hands rested on the truck and his eyes were carefully fixed on the load it bore. This was a black, iron-bound case about four feet long, three feet deep and perhaps a yard in height. On each side in red letters were the words:

"Explosive; no fire." Beneath this ominous legend were two large iron handles.

When the men drawing the truck quickened their pace the boy spoke to them sharply and they fell again into a steady walk. For the curious onlookers through whom the strange little caravan passed the lad by the side of the truck seemed to have no concern. A traveling cap was pushed back from his young face and his keen and alert eyes and the tone of his voice indicated a quality that goes with those born to command.