[Sidenote: Valerius Maximus.] The nine books of _Memorable Doings and Sayings_ (_Facta et Dicta Memorabilia_), by Valerius Maximus, were written not far from 30 A. D., and dedicated to Tiberius. Of the writer little is known except that he accompanied Sextus Pompeius to Asia, about 27 B. C. He was, then, born probably as early as 47 B. C., and can hardly have lived long after the completion of his books. Many of the anecdotes contained in his work are interesting, but the style is artificial, pompous, and dull. The most servile flattery is given to Tiberius, Julius Cæsar, and Augustus. The anecdotes cover a wide range of subjects—religion, ancient customs, all varieties of character, fortune, old age, remarkable deaths, and many more. Naturally, the work contains some valuable information, but this is thinly distributed through the nine books. The work was, however, popular in the Middle Ages, and is preserved in many manuscripts. A book on words, especially names (_De Prænominibus, etc._), contained in the manuscripts of Valerius Maximus, is by some unknown author and is of little value. [Sidenote: Celsus.] Aulus Cornelius Celsus wrote an encyclopedia, which contained treatises on agriculture, medicine, the art of war, oratory, jurisprudence, and philosophy. Part, at least, of this great work was written under Tiberius, but other parts may have been written later, for there is no definite indication of the date of the author’s birth or death. Only the treatise on medicine (Books VI-XIII of the entire work) is preserved. This shows that Celsus was well versed in the medical science of his day, and that medical science had at that time reached a high degree of perfection. Celsus writes in a simple, straightforward style, without the artificial rhetoric or the poetic phraseology common among post-Augustan prose writers. His work was deservedly popular among those who wished for scientific knowledge in the Middle Ages, was one of the first books printed after the invention of the printing-press, and was used as a text-book for medical students until recent times. Whether the other parts of the encyclopedia were as good as the treatise on medicine can not now be determined. The treatise on agriculture is mentioned with respect by Columella, but Quintilian speaks slightingly of Celsus, perhaps on account of defects in the rhetorical parts of his work.