Reasoning against Madness: Psychiatry and the State in Rio de Janeiro, 1830-1944 examines the emergence of Brazilian psychiatry, looking at how its practitioners fashioned themselves as the key architects in the project of national regeneration. The book’s narrative involves a cast of varied characters in an unstable context: psychiatrists, Catholic representatives, spiritist leaders, state officials, and the mentally ill, all caught in the shifting landscape of modern state formation.