In a paper published in the Proceedings of the British Academy, I tried to shew that the cities of Ionia which took part in the revolt against Persia in the years B.C. 500–494 issued an uniform coinage in electrum. So far as I am aware, this discovery has met with general acceptance. It may, however, in consequence of the place where it appeared, not have come fairly before most of those who are interested in Greek history and archaeology. I therefore propose here to state my view somewhat more in detail, and to trace certain corollaries which are as yet unpublished.I need not go through the story of the Ionian Revolt, as narrated by Herodotus: it is fair to assume that every scholar is familiar with it. It may, however, be well here to mention the cities, the names of which occur in this section of the story of Herodotus, with the definite facts recorded of them, as the issues of coins would probably be civic issues. It was Miletus, under the guidance of Aristagoras, which began the revolt (v. 35). It spread rapidly to Mylasa and Termera in Caria, as well as to Mytilene and Cyme.