  The best reconstructions to date are thus able to give a clear impression of the structure of a whole book, as with On Music IV, On Poems I, Rhetoric II, and VIII. In these books Philodemus summarises the work—often in the form of a number of relatively short quotations—of one or more opponents: in On Music IV, the Stoic Diogenes of Babylon; in On Poems I, the literary theorist Crates of Mallos, along with others referred to as ‘critics’ (kritikoi). Philodemus then goes back over the quotations in order, refuting each of their positions, often several times over.