This collection of Pope Leo XIII's encyclicals includes: Inscrutabili Dei Consilio (On the Evils of Society) 1878, Quod Apostolici Muneris (On Socialism) 1878, Arcanum (On Christian Marriage) 1880, Humanum Genus (On Freemasonry) 1884, Epistola Tua 1885, Spectata Fides (On Christian Education) 1885, Est Sane Molestum 1888, Exeunte Iam Anno (On Right Ordering of Christian Life) 1888, Dall'alto Dell'apostolico Seggio (On Freemasonry in Italy) 1890, Inimica Vis (On Freemasonry) 1892, Custodi Di Quella Fede (On Freemasonry) 1892, On Protestant Proselytism in Rome 1900.