When a traveler in the early days of the west, came to the Mississippi, he discovered there was no bridge. Fortunately it was winter and the great river was sheeted over with ice. But the traveler was afraid to trust himself to it, not knowing how thick it was. Finally with infinite caution, he crept on his hands and knees and managed to get halfway over. And then he heardyes he heard singing from behind. Cautiously he turned, and there, out of the dusk, came another traveler, driving a four-horse load of coal over the ice, singing as he went!