The Roman empire in ancient times afforded the clearest demonstration of the truth of these principles; and the fate of their vast dominion shows, in the most decisive manner, what is the inevitable consequence to which the free trade principles, now so strongly contended for by a party in this country, must lead. Alison is the first modern author with whom we are acquainted, who has traced the decline of the Roman empire in great part to this source. In the tenth volume of his "History of Europe," p. 752, we find the following passage:—
"No nation can pretend to independence which rests for any sensible protion of its subsistence in ordinary seasons on foreign, who may become hostile, nations. And if we would see a memorable example of the manner in which the greatest and most powerful nation may, in the course of ages, come to be paralysed by this cause, we have only to cast our eyes on imperial Rome, when the vast extent of the empire had practically established a free trade in grain with the whole civilized world; and the result was, that cultivation disappeared from the Italian plains, that the race of Roman agriculturists, the strength of the empire, became extinct, that the fields were laboured only by slaves and cattle. The legions could no longer be recruited but from foreign bands, vast tracts of pasturage overspread even the fields of Lombardy and the Compagna of Naples, and it was the plaintive confession of the Roman annalist, that the mistress of the world had come to depend for her subsistence on the floods of the Nile."
This observation has excited, as well it might, the vehement indignation of the free trade journals. The example of the greates and most powerful nation that ever existed being weakened, and at length ruined by a free trade in corn, afforded too cogent an argument, and was too striking a warning, not to excite the wrath of those who would precipitate Great Britain into a similar course of policy. They have attacked the author, accordingly, with unwonted asperity; and, while they admint the ruin of Italian agriculture in the later stages of the Roman empire, endeavour to ascribe it to the gratuitous distribution of grain to the Roman populace, not the effect of a free importation of grain from its Egyptian and African provinces. The vast importance of the subject has induced us to look into the original authorities to whom Alison refers in support of his observation, and from among them we select three—Tacitus, Gibbon, and Michelet. Tacitus says,
"At Hercule olim ex Itaila legionibus longinquas in provincias commeatus portabantur, nec nunc infecunditate laboratur; sed Africam potius et Egyptum exercemus, navibusque et casibus vita populi Romani permissa est."—TACITUS, Annal. xii. 43.
Antiquity does not contain a more pregnant and important passage, or one more directly bearing on the present policy of the Britsh emprire, than this. It demonstrates: 1, That in former times Italy had been an exporting country: "olim ex Italia commeatus in longinquas provincias portabantur." 2, That at the time when Tacitus wrote, in the days of the Emperor Trajan, it had ceased to be so, and had come to import largely from Africa and Lybia, "sed nunc Africam potius et Egyptum exercemus." 3, That this was not the result of any supervening sterility or unfruitfulness, "nec nunc infecunditate laboratur," but was from causes which made it more profitable to purchase grain in the Egyptian or Lybian markets, "sed Africam POTIUS et Egyptum exercemus."
Of the extent to which this decay of agriculture in the central provinces of the Roman empire went, in the latter stages of its history, we have the following striking account in the authentic pages of Gibbon:—
"Since the age of Tiberius the decay of agriculture had been felt in Italy; and it was a just subject of complaint that the life of the Roman people depended on the accidents of the winds and the waves. In the division and decline of the empire, the tributary harvests of Egypt and Africa were withdrawn; the numbers of the inhabitants continually diminished with the means of subsistence; and the country was exhausted by the irretrievable losses of war, pestilence, and famine. Pope Gelasius was a subject of Odoacer, and he affirms, with strong exaggeration, that, in Emilia, Tuscany, and the adjacent provinces, the human species was almost extirpated."—GIBBON, vol. vi. c. xxxvi. p. 235.
Of the progress and extent of this decay, Gibbon gives the following account in another part of his great work:—
"The agriculture of the Roman provinces was insensibly ruined; and in the progress of despotism, which tends to disappoint its own purpose, the emperors were obliged to derive some merit from the forgiveness of debts, or the remission of tributes, which their subjects were utterly incapable of paying. According to the new division of Italy, the fertile and happy province of Campania, the scene of the early victories and of the delicious retirements of the citizens of Rome, extended between the sea and the Apennines, from the Tiber to the Silarius. Within sixty years after the death of Constantine, and on the evidence of an actual survey, an exemption was granted in favour of 330,000 English acres of desert and uncultivated land, which amounted to one-eighth of the whole surface of the province. As the footsteps of the barbarians had not yet been seen in Italy, the cause of this amazing desolation, which is recorded in the laws, (Cod. Theod. lxi. t. 38, l. 2,) can be ascribed only to the administration of the Roman emperors."—GIBBON, vol. iii. c. xviii. p. 87. Edition in 12 volumes.
Michelet observes, in his late profound and able History of France—