Note 23 — PART III CORRESPONDENCE BETWEEN PLINY AND TRAJAN

It seems most probable that the first nine Books of Pliny’s Letters were put out in “book form” for public use at different periods—and subsequently collected in one volume. The “official” correspondence between Pliny and Trajan was apparently “published” somewhat later. But it is evident that in the days of Symmachus (end of fourth century) the whole had been placed together, and thus made up the ten Books we now possess.