With the exception of Athens, we do not know completely the calendar of a single other Grecian city: but we know that the months of all were lunar months, and that the practice followed in regard to intercalation, for the prevention of inconvenient divergence between lunar and solar time, was different in each different city. Accordingly, the lunar month of one city did not, except by accident, either begin or end at the same time as the lunar month of another. M. Boeckh observes (ad Corp. Inscr. t. i, p. 734): “Variorum populorum menses, qui sibi secundum legitimos annorum cardines respondent, non quovis conveniunt anno, nisi cyclus intercalationum utrique populi idem sit: sed ubi differunt cycli, altero populo prius intercalante mensem dum non intercalat alter, eorum qui non intercalarunt mensis certus cedit jam in eum mensem alterorum qui præcedit illum cui vulgo respondet certus iste mensis: quod tamen negligere solent chronologi.” Compare also the valuable Dissertation of K. F. Hermann, Ueber die Griechische Monatskunde, Götting. 1844, pp. 21-27, where all that is known about the Grecian names and arrangement of months is well brought together. The names of the Argeian months we hardly know at all (see K. F. Hermann, pp. 84-124): indeed, the only single name resting on positive proof, is that of a month _Hermæus_. How far the months of Argos agreed with those of Epidaurus or Sparta we do not know, nor have we any right to presume that they did agree. Nor is it by any means clear that every city in Greece had what may properly be called a _system_ of intercalation, so correct as to keep the calendar right without frequent arbitrary interferences. Even at Athens, it is not yet satisfactorily proved that the Metonic calendar was ever actually received into civil use. Cicero, in describing the practice of the Sicilian Greeks about reckoning of time, characterizes their interferences for the purpose of correcting the calendar as occasional rather than systematic. Verres took occasion from these interferences to make a still more violent change, by declaring the Ides of January to be the calends of March (Cicero, Verr. ii, 52, 129).