In 1884 Ivo Bruns began his Lucrez-Studien, on the relationship between Lucretius' treatment of Epicureanism and the exposition by the philosopher himself in the extant Epistles, with the question (p.4) for whom did Lucretius write? His answer was to show (p.l 1) that the general public, who were the poet's real objective, were very different readers from the disciples whom Epicurus addressed in the Letter to Herodotus and similar works. This conclusion, and the subsequent investigation of the ways in which this difference affected the treatment of doctrine in the two works, does not concern me. My interest is rather in the manner in which Bruns tackles the problem of the ostensible addressee, Memmius, and the extent to which this man remains in Lucretius' mind throughout the whole six books.