A more liberal art was cultivated, however, by the sage of Rome, who, in a stricter sense, may be considered as the authors of the civil law. The alteration of the idiom and manners of the Romans rendered the style of the Twelve Tables less familiar to each rising generation, and the doubtful passages were imperfectly explained by the study of legal antiquarians. To define the ambiguities, to circumscribe the latitude, to apply the principles, to extend the consequences, to reconcile the real or apparent contradictions, was a much nobler and more important task; and the province of legislation was silently invaded by the expounders of ancient statutes. Their subtle interpretations concurred with the equity of the prÊtor, to reform the tyranny of the darker ages: however strange or intricate the means, it was the aim of artificial jurisprudence to restore the simple dictates of nature and reason, and the skill of private citizens was usefully employed to undermine the public institutions of their country. The revolution of almost one thousand years, from the Twelve Tables to the reign of Justinian, may be divided into three periods, almost equal in duration, and distinguished from each other by the mode of instruction and the character of the civilians. Pride and ignorance contributed, during the first period, to confine within narrow limits the science of the Roman law. On the public days of market or assembly, the masters of the art were seen walking in the forum ready to impart the needful advice to the meanest of their fellow-citizens, from whose votes, on a future occasion, they might solicit a grateful return. As their years and honors increased, they seated themselves at home on a chair or throne, to expect with patient gravity the visits of their clients, who at the dawn of day, from the town and country, began to thunder at their door. The duties of social life, and the incidents of judicial proceeding, were the ordinary subject of these consultations, and the verbal or written opinion of the _juris-consults_ was framed according to the rules of prudence and law. The youths of their own order and family were permitted to listen; their children enjoyed the benefit of more private lessons, and the Mucian race was long renowned for the hereditary knowledge of the civil law. The second period, the learned and splendid age of jurisprudence, may be extended from the birth of Cicero to the reign of Severus Alexander. A system was formed, schools were instituted, books were composed, and both the living and the dead became subservient to the instruction of the student. The _tripartite_ of ∆lius PÊtus, surnamed Catus, or the Cunning, was preserved as the oldest work of Jurisprudence. Cato the censor derived some additional fame from his legal studies, and those of his son: the kindred appellation of Mucius ScÊvola was illustrated by three sages of the law; but the perfection of the science was ascribed to Servius Sulpicius, their disciple, and the friend of Tully; and the long succession, which shone with equal lustre under the republic and under the CÊsars, is finally closed by the respectable characters of Papinian, of Paul, and of Ulpian. Their names, and the various titles of their productions, have been minutely preserved, and the example of Labeo may suggest some idea of their diligence and fecundity. That eminent lawyer of the Augustan age divided the year between the city and country, between business and composition; and four hundred books are enumerated as the fruit of his retirement. Of the collection of his rival Capito, the two hundred and fifty-ninth book is expressly quoted; and few teachers could deliver their opinions in less than a century of volumes. In the third period, between the reigns of Alexander and Justinian, the oracles of jurisprudence were almost mute. The measure of curiosity had been filled: the throne was occupied by tyrants and Barbarians, the active spirits were diverted by religious disputes, and the professors of Rome, Constantinople, and Berytus, were humbly content to repeat the lessons of their more enlightened predecessors. From the slow advances and rapid decay of these legal studies, it may be inferred, that they require a state of peace and refinement. From the multitude of voluminous civilians who fill the intermediate space, it is evident that such studies may be pursued, and such works may be performed, with a common share of judgment, experience, and industry. The genius of Cicero and Virgil was more sensibly felt, as each revolving age had been found incapable of producing a similar or a second: but the most eminent teachers of the law were assured of leaving disciples equal or superior to themselves in merit and reputation.