1892); Historical Sketch of Sacerdotal Celibacy (Philadelphia, 1867); History of the Inquisition of the Middle Ages (New York, 1888); Chapters from the religious history of Spain connected with the Inquisition (Philadelphia, 1890); History of auricular Confession and Indulgences in the Latin Church (3 vols., London, 1896); The Moriscos of Spain (Philadelphia, 1901), and History of the Inquisition of Spain (4 vols., New York and London, 1906-1907).