A collection of pamphlets published by the Positivist Church of Brazil. The pamphlets date from the late-19th to mid- 20th century and, with few exceptions, are written in Portuguese language by Miguel Lemos and Raimundo Teixeira Mendes, known as the Positivist apostles. The collection serves as a testimony of the profound influence that positivism had in Brazil. It reveals the multiple interests and activities of the heterodox and orthodox branches of the Positivist movement in Brazil, ranging not only from immigration and women’s rights to orthographic standardization, but also the systematic approach and extent to which the Positivist Church in Brazil carried forth its plans for social reformation.