While the high-born magistrates of the republic entered upon their one year’s tenure of office without any training whatsoever, and were, of course, obliged to rely upon the knowledge and trustworthiness of the permanent staff of clerks, recorders and cashiers in their department, there grew up under the empire a professional class of government officials who, schooled by years of experience and continuance in office and supported by a numerous staff recruited from the imperial freedmen and slaves, were in a position to cope with the requirements of a world-wide empire. These procurators, some as governors-in-chief of the smaller imperial provinces, some as assistants to the governors of the greater, watched over the interests of the public exchequer and the emperor’s private property, or looked after the imperial buildings and aqueducts, the imperial games, the mint, the corn supply of Rome and the alimentary institutions, the legacies left to the emperors, their castles and demesnes in Italy and abroad--in short, everything that fell within the vast and ever widening sphere of imperial government. Meanwhile the exchequer of the senate dwindled and dwindled, till it finally came to be merely the exchequer of the city of Rome. _Taxation Reforms_ The government department which underwent the most important change was that of taxation. And there, again, Augustus with the co-operation of his loyal colleague and friend Agrippa carried out the decisive reform which stood the test of time till at least the middle of the second century in spite of mismanagement and the exactions of despots, and secured the prosperity of the empire during that period. While the indirect taxes, the _vectigalia_, continued in the main to be levied on the easy but (for the state and still more for its subjects) unprofitable plan of farming them out to companies of publicans, which had come down from republican days--though the publicans were now placed under the strict supervision of the imperial procurators--the _tributa_, which was assessed according to a fixed scale partly in money and partly in kind, the poll-tax and the land-tax were thenceforth levied directly by government officials, and the extortionate tax-farmers were finally banished from this most important branch of the public service.