In his recent book, Professor J. S. Morrison has brought to a happy conclusion a quarter of a century and more of inspired research into the problem of how the oars of a classical trireme were arranged. The essence of his solution of this perennial problem is that the fifth-century Athenian trireme had her oars and benches alike disposed at three different levels, each rower having his own oar, and each oar its separate thole set at a distance of feet, not inches, from its neighbours. The evidence is marshalled with such mastery that it may be thought unlikely that there will ever be any general recrudescence of the di (or al) scaloccio and a zenzile (or alle sensile) theories that were as fashionable once as they are seen now to have been unhistorical. In his inquiry, however, Professor Morrison has wisely confined himself to the ancient sources, and no more than touched upon the analogy of the Byzantine dromon, the direct descendant of the classical trireme and to some extent the parent of the a zenzile galley. Other protagonists, and notably Tarn, have been far from sharing his discretion, and there is still room perhaps for a brief note calling attention to the possibility that the dromon of the Middle Ages may shed indirect light upon the trireme of fifteen hundred years earlier.