Among the problems of ancient history of which no solution has yet been generally recognized as definitive is that of the battle-field where the struggle between Pompey and Caesar was decided. Colonel Leake's exposition was rejected by von Göler and Sir William Napier; and the paper in which he endeavoured to vindicate it produced little effect. Napier and von Göler constructed theories which were vitiated by the misleading maps on which they worked. M. Léon Heuzey, the chief of the Macedonian mission which collected information for the contemplated final volume of Napoleon the Third's Histoire de Jules César, performed a valuable service by preparing, with the aid of an engineer officer, M. Laloy, the first trustworthy survey of the Pharsalian region; but his dissertation on the battle, published in 1886, was bitterly derided by Colonel Stoffel, who, however, appropriated his predecessor's maps without acknowledgment. About the same time Mr. Perrin published in the American Journal of Philology a valuable article, which, although it convinced many that the battle had been fought, as von Göler, Napier, and Long maintained, on the northern bank of the Enipeus, was necessarily written without any knowledge of the works of Heuzey and Stoffel.