In science, which, being fixed and limited, admits of no other variety than such as arises from new methods of distribution, or new arts of illustration, the necessity of following the traces of our predecessors is indisputably evident; but there appears no reason, why imagination should be subject to the same restraint. It might be conceived, that of those who profess to forsake the narrow paths of truth, every one may deviate towards a different point, since, though rectitude is uniform and fixed, obliquity may be infinitely diversified. The roads of science are narrow, so that they who travel them, must either follow or meet one another; but in the boundless regions of possibility, which fiction claims for her dominion, there are surely a thousand recesses unexplored, a thousand flowers unplucked, a thousand fountains unexhausted, combinations of imagery yet unobserved, and races of ideal inhabitants not hitherto described. Yet, whatever hope may persuade, or reason evince, experience can boast of very few additions to ancient fable. The wars of Troy, and the travels of Ulysses, have furnished almost all succeeding poets with incidents, characters, and sentiments. The Romans are confessed to have attempted little more than to display in their own tongue the inventions of the Greeks. There is, in all their writings, such a perpetual recurrence of allusions to the tales of the fabulous age, that they must be confessed often to want that power of giving pleasure which novelty supplies; nor can we wonder that they excelled so much in the graces of diction, when we consider how rarely they were employed in search of new thoughts. The warmest admirers of the great Mantuan poet can extol him for little more than the skill with which he has, by making his hero both a traveller and a warrior, united the beauties of the Iliad and the Odyssey in one composition: yet his judgment was perhaps sometimes overborne by his avarice of the Homeric treasures; and, for fear of suffering a sparkling ornament to be lost, he has inserted it where it cannot shine with its original splendour.