 Some interesting articles from his pen appeared in the "Catholic World" on "Ireland's Mission" (May, 1870); "The Ancient Irish Churches" (July, 1870), written while yet a Protestant, and "Pius IX and Mr. Gladstone's Misrepresentations" (May, 1875).His Vatican researches led to the publication of two volumes on "Episcopal Succession in England, Scotland, and Ireland, A.D. 1400 to 1875, with Appointments to Monasteries, and Extracts from Manuscripts in Public and Private Libraries in Rome, Florence, Bologna, Vienna, and Paris" (Rome, 1876–77).He also brought out, "Annals of the Catholic Hierarchy in England and Scotland, A.D. 1585-1876, with a Dissertation on Anglican Orders" (Rome, 1877; London, 1883).