At intervals Harry turned the crank of the patent fog-horn and a lugubrious wail arose to lose itself in the impenetrable mist. Between times, from various directions, far and near, came similar sounds. Save for these warnings the silence was deep. What breeze there had been was scarcely perceptible, although the bank of fog was not stationary, but moved constantly across them toward the mainland. Once or twice its grayness was tinged with amber as, for a moment only, the sun came through the clouds above. Kendall, seated at the forward end of the cabin roof, strained his eyes into the blank wall ahead. Ten minutes passed. From somewhere off the bow came the faint shriek of a locomotive.