Expecting Pears from an Elm Tree is based on twenty years of research, including visits to the sites of nearly every mission discussed and interviews with descendants of mission Indians, Indian chiefs, Franciscan friars, mestizo settlers, and teachers. Langer chronicles how, beginning in the 1840s, the establishment of missions fundamentally changed the relationship between the Chiriguano villages and national society. He looks at the Franciscan missionaries’ motives, their visions of ideal missions, and the realities they faced. He also examines mission life from the Chiriguano point of view, considering their reasons for joining missions and their resistance to conversion, as well as the interrelated issues of Indian acculturation and the development of the mission economy, particularly in light of the relatively high rates of Indian mortality and outmigration. Expanding his focus, Langer delves into the complex interplay of Indians, missionaries, frontier society, and the national government until the last remaining missions were secularized in 1949. He concludes with a comparative analysis between colonial and republican-era missions throughout Latin America.