It was afternoon when they reached the ford. The hills had sunk away to low up-sweepings of gray soil, no longer hiding the plain which lay yellow against a cobalt sky. As the wagons rolled up on creaking wheels the distance began to darken with the buffalo. The prospect was like a bright-colored map over which a black liquid has been spilled, here in drops, there in creeping streams. Long files flowed from the rifts between the dwarfed bluffs, unbroken herds swept in a wave over the low barrier, advanced to the river, crusted its surface, passed across, and surged up the opposite bank. Finally all sides showed the moving mass, blackening the plateau, lining the water's edge in an endless undulation of backs and heads, foaming down the faces of the sand slopes. Where the train moved they divided giving it right of way, streaming by, bulls, cows, and calves intent on their own business, the earth tremulous under their tread. Through breaks in their ranks the blue and purple of the hills shone startlingly vivid and beyond the prairie lay like a fawn-colored sea across which dark shadows trailed. The ford was nearly a mile wide, a shallow current, in some places only a glaze, but with shifting sands stirring beneath it. Through the thin, glass-like spread of water the backs of sand bars emerged, smooth as the bodies of recumbent monsters. On the far side the plateau stretched, lilac with the lupine flowers, the broken rear line of the herd receding across it. The doctor, feeling the way, was to ride in the lead, his wagon following with Susan and Daddy John on the driver's seat. It seemed an easy matter, the water chuckling round the wheels, the mules not wet above the knees. Half way across, grown unduly confident, the doctor turned in his saddle to address his daughter when his horse walked into a quicksand and unseated him. It took them half an hour to drag it out, Susan imploring that her father come back to the wagon and change his clothes. He only laughed at her which made her angry. With frowning brows she saw him mount again, and a dripping, white-haired figure, set out debonairly for the opposite bank. The sun was low, the night chill coming on when they reached it. Their wet clothes were cold upon them and the camp pitching was hurried. Susan bending over her fire, blowing at it with expanded cheeks and, between her puffs, scolding at her father, first, for having got wet, then for having stayed wet, and now for being still wet, was to David just as charming as any of the other and milder apotheoses of the Susan he had come to know so well. It merely added a new tang, a fresh spice of variety, to a personality a less ravished observer might have thought unattractively masterful for a woman.