In my recent article on the Ionian Confederacy I omitted to mention an important piece of evidence relating to the League in its most critical days. It has been shown by Prof. P. Gardner that during the Ionian Revolt a monetary convention was established among a group of insurgent cities. Several Ionian towns, whose number cannot at present be shown to have exceeded nine or ten, but may be extended by further research, issued a set of electrum coins with an identical reverse pattern on the same standard of weight. The common type would appear to have been derived from Chios; the standard of weight is that of Miletus.