"The novel was begun in 1926, when I was twenty-four years old and working as a telephone engineer in Imperial Valley, on the California-Baja California border. During my stay there I made a horseback trip down into the little-known desert interior of Lower California. After having lived all of my early years in the high Rockies of California, I was unprepared for the vast sweep of sunstruck desert with its flat wastes, clumps of cacti, and barren...