According to the first book of the Cyropaedia, professors of tactics, a small part of the science of war, were already instituted in Persia, by which Greece must be understood. A good edition of all the Scriptores Tactici would be a task not unworthy of a scholar. His industry might discover some new MSS., and his learning might illustrate the military history of the ancients. But this scholar should be likewise a soldier; and alas! Quintus Icilius is no more.