they fairly earned their income, and saved more to their subjects than they extorted from them.  They repressed brigandage, piracy, competition between the various cities, and local wars; while quarrels, which formerly would have been settled by an appeal to arms, were now composed before their judgment-seats, and in case of need the rival factions were forcibly compelled to submit to their decisions.  They kept up the roads, and afforded complete security to travellers by night and day; they protected industries and agriculture, and, in accordance with the precepts of their religious code, they accounted it an honourable task to break up waste land or replant deserted sites.  Darius himself did not disdain to send congratulations to a satrap who had planted trees in Asia Minor, and laid out one of those wooded parks in which the king delighted to refresh himself after the fatigues of government, by the exercise of walking or in the pleasures of the chase.  In spite of its defects, the system of government inaugurated by Darius secured real prosperity to his subjects, and to himself a power far greater than that enjoyed by any of his predecessors.  It rendered revolts on the part of the provincial governors extremely difficult, and enabled the court to draw up a regular budget and provide for its expenses without any undue pressure on its subjects; in one point only was it defective, but that point was a cardinal one, namely, in the military organisation.  Darius himself maintained, for his personal protection, a bodyguard recruited from the Persians and the Medes.  It was divided into three corps, consisting respectively of 2000 cavalry, 2000 infantry of noble birth, armed with lances whose shafts were ornamented below with apples of gold or silver—­whence their name of melophori—­and under them the 10,000 “immortals,” in ten battalions, the first of which had its lances ornamented with golden pomegranates.  This guard formed the nucleus of the standing army, which could be reinforced by the first and second grades of Persian and Median feudal nobility at the first summons.  Forces of varying strength garrisoned the most important fortresses of the empire, such as Sardes, Memphis, Elephantine, Daphnae, Babylon, and many others, to hold the restless natives in check.  These were, indeed, the only regular troops on which the king could always rely.  Whenever a war broke out which demanded no special effort, the satraps of the provinces directly involved summoned the military contingents of the cities and vassal states under their control, and by concerted action endeavoured to bring the affair to a successful issue without the necessity of an appeal to the central authority.  If, on the contrary, troubles arose which threatened the welfare of the whole empire, and the sovereign felt called upon to conduct the campaign in person, he would mobilise his guard, and summon the reserves from several provinces or even from all of them.  Veritable hordes of recruits then poured in, but these