At a crawl Jack proceeded. The vibration became more violent. On one side the track began to dip. Momentarily Jack hesitated, and paused. At once came a picture of the train rushing toward him, and conquering his fear, he went on.

Suddenly the track swayed violently, then dipped sharply sideways. With a cry Jack sprang off backwards, and threw himself flat on his face on the sleepers. Trembling, deafened by the roar of the cataract just beneath him, he lay afraid to move, believing the swaying structure would give way every instant. But finally the rails steadied, and partly righted; and regaining his courage, Jack rose to his knees, and began working his way forward from tie to tie, pushing the bicycle ahead of him.

Presently the rails became steadier. Cautiously he climbed back into the saddle, and slowly at first, then with quickly increasing speed and rising hope, pushed on. The vibration decreased, the track again became even and firm. Suddenly at last the thunder of the river passed from below him, and he was safely across.

A few yards from the bridge, and still in the mist, Jack peered down to see that the oil can was safe. He caught his breath. Reaching out, he felt about the little platform with his foot.

Yes; it was gone! The tipping of the car had sent it into the river.

As the significance of its loss burst upon him, and he thought of the peril he had come through to no purpose, Jack sat upright in the saddle, and the tears welled to his eyes.

Promptly, however, came remembrance of the Riverside Park station, a mile ahead of him. Perhaps there was oil there!

Clenching his teeth, and bending low over the handlebars, Jack shot on, determined to fight it out to the finish.

Meantime, at the main office the entire staff, including the superintendent, the chief despatcher and Alex, were crowded in the western windows, watching, waiting and listening. Shortly after Alex had announced Jack’s departure a suppressed shout had greeted the tiny light of his lantern on the bridge approach, and a subdued cheer of good luck had followed him as he had disappeared into the wall of mist.

Then had succeeded a painful silence, while all eyes were fixed anxiously on the spot opposite where a light west wind, blowing down through a cut in the hills, occasionally lifted the blanket of fog and dimly disclosed the river bank and track.