In an attempt to organize the swiftly-growing diversity in Christianity during the nineteenth century, the author compiled a learned compendium of the known religious groups of his day. A unique glimpse into the history of early-modern religious thought, this reference work includes extensive articles on the various collections of believers both Christian and non-Christian. Blunt, in a move that presaged the more comprehensive modern studies of the phenomenon of religious diversification, included exotic religions that were beginning to be taken seriously during his century.