After being long held as an almost infallible authority, Pliny, in more recent times, fell under the reproach of credulity and want of sufficient discrimination in the value of his sources. Further research has gone some way to reinstate his reputation. Without having any profound original knowledge of the particular sciences, he had a naturally scientific mind. His tendency to give what is merely curious the same attention as what is essentially important, has incidentally preserved much valuable detail, especially as regards the arts; and modern research often tends to confirm the anecdotes which were once condemned as plainly erroneous and even absurd. Pliny has, further, the great advantage of being shut up in no philosophical system. His philosophy of life, and his religion so far as it appears, is that of his age, a moderate and rational Stoicism. Like his contemporaries, he complains of the modern falling away from nature and the decay of morals. But it is as the conscientious student and the unbiassed observer that he habitually appears. In diligence, accuracy, and freedom from preconception or prejudice, he represents the highest level reached by ancient science after Aristotle and his immediate successors. Of the more specialised scientific treatises belonging to this period, only two are extant, the three books on _Strategy_ by Sextus Julius Frontinus, and a treatise by the same author on the public water-supply of Rome; both belong to strict science, rather than to literature. The schools of rhetoric and grammar continued to flourish: among many unimportant names that of Quintilian stands eminent, as not only a grammarian and rhetorician, but a fine critic and a writer of high substantive value.