by prayer; it says that it is more important to preach about morals than on faith, that for moral sermons the human heart must be studied, and that the best way of doing so is (as Massillon recommended in later times) to look into one's own. It is more original and more independent than the work of Rabanus Maurus, who, as has been said, drew largely from St. Augustine. Guibert's work was recommended by Pope Alexander as a model to all preachers. St. Francis gave to his friars the same directions as are herein contained. Alain de Lille To the same period belongs the "Summa de arte prædicatoriâ" by Alain de Lille, which defines preaching: "Manifesta et publica instructio morum et fidei, informationi hominum deserviens, ex rationum semitâ et auctoritatum fonte proveniens". He lays stress on explanation and use of Scripture and recommends the preacher to insert verba commotiva. The remarks of Cæsarius of Heisterbach (died 1240) have been collected by Cruel; his sermons display skill in construction and considerable oratorical power. Conrad of Brundelsheim (died 1321), whose sermons have come down to us under his cognomen of "Brother Sock" (Sermones Fratris Socci), was one of the most interesting preachers at this time in Germany. Humbert of Romans, General superior of the Dominicans, in the second book of his work, "De eruditione prædicatorum", claims that he can teach "a way of promptly producing a sermon for any set of men, and for all variety of circumstances". Linsenmayer, in his history of preaching, gives information about Humbert, who was a severe critic of the sermons of his time. Trithemius quotes a work by Albertus Magnus, "De arte prædicandi", which is lost. St. Bonaventure wrote "De arte concionandi", in which he treats of divisio, distinctio, dilatatio, but deals extensively only with the first. Thomas Aquinas Thomas Aquinas's claim rests chiefly on the "Summa", which, of course, has principally influenced preaching since, both in matter and form. He insists very strongly on the importance of preaching, and says that it belongs principally to bishops, and baptizing to priests, the latter of whom he regards as holding the place of the seventy disciples. There is a treatise entitled De arte et vero modo prædicandi attributed to him, but it is simply a compilation of his ideas about preaching that was made by another. Henry of Hesse is credited with a treatise, "De arte prædicandi",