The Rev. Father J. B. Lemius, O.M.I., was a priest and author of the nineteenth and twentieth centuries. His Catechism of Modernism, founded on Pope St. Pius X's encyclical Pascendi Dominici Gregis, attempts to break down and organize the various beliefs of the modernists. Father Lemius' work was praised by Pope Pius X, along with an added hope of a wide circulation. It was originally published in the early 1900s by the Society for the Propagation of the Faith, New York, and subsequently reprinted by TAN in 1981.