When Captain James Bonneville left for California in May of 1832 his motives were mixed. Officially, the French-born officer was on a two-year leave of absence from the U. S. Army, but he carried orders to collect information on the geography, geology, and topography "of the Country within the limits of the Territories belonging to the United States, between our frontier, and the Pacific." No one heard from him for five years, and he was assumed he...