  That Philodemus composed these books as part of a coherent series is clear not only from the presence of both individual descriptive titles and generic titles in the rolls of this edition, but also from the end of On Arrogance: ‘We shall end this treatise here, but we shall add to it the treatment of the other vices which we think we should discuss’. Still, in the course of these books, Philodemus also refers to others, which may or may not have been part of the series: On Beauty and On Eros, which contained remarks intended to prevent people from falling prey to flattery (cited at PHerc. 1457 fr. 23.8–10); On Wealth (mentioned at PHerc. 1424.12.17–25; we have the first book in PHerc. 163 and perhaps another book in PHerc. 209); On Wealth and Poverty (perhaps contained in PHerc. 1570; or perhaps this is another name for On Wealth), On the Extravagant and Simple Lifestyles, and On Choices and Avoidances (cited in PHerc. 1424.28.5).