  Philodemus composed at least two multi-volume works on explicitly moral subjects. One was On Vices, or, as the titles of some of its books indicate, On Vices and their Opposing Virtues and Those in whom and Concerning what things they occur. Individual books of this set seem to have borne individual titles, two of which are known: On Flattery (On Vices Book 1: PHerc. 222+223+1082+1675 and perhaps a couple of other fragmentary pieces; PHerc. 1457, dealing with vices similar to flattery, may have been either a second book or the conclusion of the same book, carried over onto a second roll, giving the treatise a structure like that of Book 10) and On Arrogance (On Vices Book 10: PHerc. 1008); two other books whose title indicated that they belonged to the set, but whose individual titles are lost, dealt with household management (On Vices Book 9: PHerc. 1424) and greed (PHerc. 253). These four books are all written in the same hand, and another by the same scribe, dealing with slander (PHerc. Paris. 2), is also likely to have been part of the overall work On Vices. Besides having been written by the same scribe, evidently as part of a fairly uniform edition, at least three of these books were addressed to the circle of Roman poets Plotius Tucca, Varius, Virgil and Quintilius Varus (PHerc. 253 fr. 12.4; On Flattery, PHerc. 1082.11.3; On Slander, PHerc. Paris. 2 fr. 279.10–11).