The number of subjects who acknowledged the laws of Rome, of citizens, of provincials, and of slaves, cannot now be fixed with such a degree of accuracy, as the importance of the object would deserve. We are informed, that when the Emperor Claudius exercised the office of censor, he took an account of six millions nine hundred and forty-five thousand Roman citizens, who, with the proportion of women and children, must have amounted to about twenty millions of souls. The multitude of subjects of an inferior rank was uncertain and fluctuating. But, after weighing with attention every circumstance which could influence the balance, it seems probable that there existed, in the time of Claudius, about twice as many provincials as there were citizens, of either sex, and of every age; and that the slaves were at least equal in number to the free inhabitants of the Roman world. * The total amount of this imperfect calculation would rise to about one hundred and twenty millions of persons; a degree of population which possibly exceeds that of modern Europe, and forms the most numerous society that has ever been united under the same system of government. Chapter II: The Internal Prosperity In The Age Of The Antonines.—Part III. Domestic peace and union were the natural consequences of the moderate and comprehensive policy embraced by the Romans. If we turn our eyes towards the monarchies of Asia, we shall behold despotism in the centre, and weakness in the extremities; the collection of the revenue, or the administration of justice, enforced by the presence of an army; hostile barbarians established in the heart of the country, hereditary satraps usurping the dominion of the provinces, and subjects inclined to rebellion, though incapable of freedom. But the obedience of the Roman world was uniform, voluntary, and permanent. The vanquished nations, blended into one great people, resigned the hope, nay, even the wish, of resuming their independence, and scarcely considered their own existence as distinct from the existence of Rome. The established authority of the emperors pervaded without an effort the wide extent of their dominions, and was exercised with the same facility on the banks of the Thames, or of the Nile, as on those of the Tyber. The legions were destined to serve against the public enemy, and the civil magistrate seldom required the aid of a military force. In this state of general security, the leisure, as well as opulence, both of the prince and people, were devoted to improve and to adorn the Roman empire.