Research notes from the underworld: the entry logs of the Rio de Janeiro Casa de Detenção, 1860-1969.

The Rio de Janeiro state archive's collection of entry logs for the city's central detention center, going back to the mid-nineteenth century, provides a rare glimpse into the lives of Rio's—and Brazil's—poor and working classes who otherwise left few written records behind. During the time when the institution maintained the entry logs, police exercised broad power to make arrests. Although relatively few detainees were ever prosecuted or even formally charged, the detention center kept detailed records of detainees' physical appearance, attire, home address, nationality, sex, affiliation, and so on, as well as information about any criminal charges. This article explores the wealth of empirical data that the entry logs provide. It also suggests how scrutinizing this type of document across time shows how record keeping itself changed, in turn affording researchers rare insight into the inner workings of modern Latin American society.