 1.149–482. First comes, in effect, Lucretius’ ontology. Nothing comes into being out of nothing or perishes into nothing. The only two per se entities are body and void; all other existing things are inseparable or accidental properties of these (Lucretius’ own terms for which are coniuncta and eventa respectively). Two further items that might be suspected of existing independently of any concurrently existing body or void, (1) time and (2) historical facts, are argued to be in fact existentially parasitic on the presently existing world, and thus not after all per se existents.