Plowing was strange work to the patient mules and to the girl who was guiding them. To her, the level prairie, rank with goldenrod, pink-flowered smartweed, and purple aster, was a land of wondrous growth. For twenty years her home had been an arid _mesa_ far to the south, where her father captained the caretakers of a spur railroad track. The most western station-house in Texas, standing amid thorny mesquite, was her birthplace and that of her sister Marylyn; the grey plateau across which the embankment led was their playground; there they grew to womanhood under the careful guidance of their frail, Northern-born mother. And then two casualties, coming close upon each other, had suddenly changed their life. Their father was brought home one night so maimed and crushed by the wheels of a flat-car that he could never hope to take up his work again; and while he lay, bandaged and broken, fighting to keep the soul in his crippled body, their mother bravely yielded her life to a lingering illness. Many months later, when Evan Lancaster's wounds were at last healed, Ben and Betty were unhitched from a dirt-laden scraper on the siding and put before a white-topped prairie-schooner. Then the old section-boss, with his crutches beside him and his daughters seated in the all but empty box behind, said a husky farewell to the men crowding around the wagon, and started the mules along the road that led northward beside the rails. He gave no backward glance at the wind-battered house where he had brought an ailing bride; instead, eager to leave that plain of flying sand and scanty grasses, he drove the team rapidly forward, bound for a country where there were wells, and not water-cars, where rain fell oftener, and where food, both for man and beast, could be gotten easily from the earth. But Dallas, seated in the schooner's bed, her weeping sister held soothingly against her breast, watched, dry-eyed, as a mound by a giant mesquite faded slowly from her sight, and saw her girlhood's home give way, as a lighthouse sinks behind a speeding vessel, until only its grey-sprinkled roof showed through the scattered trees. Then, after pillowing Marylyn's head on a Navajo blanket beside the swashing water cask, she climbed forward to the driver's seat and took the reins from her father. It was April, and when the _mesa_ was left far to rearward, a world almost forgotten by the crippled section-boss burst in new, green loveliness upon his desert children. Towering pines and spreading oaks, lush grass strewn with blossoms, clear-running streams and gay-feathered birds replaced thirsty vegetation, salt lakes, and hovering vultures. They travelled slowly, each day bringing some fresh delight to ear and eye, until one evening in the waning Dakota summer they camped beside a great crooked split in the prairie, on a flat peninsula made by a sweeping westward bend of the muddy Missouri.