Field notes and observations from visits to San Diego and the Mexico-United States boundary, June 1849-March 1850. The accounts include botanical and geographical descriptions, as well as ethnographic reports and weather observations.
Field notes and observations from the Expedition to the Gila, September-December 1849. Includes a "sick report", description of food cultivated and gathered by the Yuma people at North Gila, thermometer readings and weather reports, barometric observations, sketches, and hand-drawn maps.