All the erudition of the age added little to the real advance of learning except in the domain of law. Industrious compilers like Pliny the elder have preserved a great deal of ancient lore for our study, but they are for the most part utterly uncritical and unscientific. There were no scientific thinkers like Aristotle in the Roman world. Still, some text-books which served the Middle Ages for instruction were produced under the principate, such as Vitruvius on architecture, Strabo and Pomponius Mela on geography, Columella on agriculture, Quintilian on rhetoric, and Galen on medicine. The latter was state-physician to Marcus Aurelius and was employed by him to study and combat the terrible plague which the Roman army brought back from the East. But for medical science he added little to his Greek master Hippocrates. In just the same way, the philosophers came no nearer to the core of reality than their masters of the fourth and third centuries before Christ, hard though they toiled and much as they spoke and wrote. They were indeed learning, what the old Greeks had failed or scorned to learn, how to apply doctrines to life, but in depth of thought they were so far behind that they ceased even to be able to comprehend Aristotle. Even Philo, the profound and learned Jewish philosopher, is doing little more than to attempt an application of Platonic and other Greek ideas to the teaching of Moses. Such originality as there was in the world of letters still proceeded mainly from the provinces. Greece was still putting forth original contributors to literature like the novelist Lucian, the biographer and moralist Plutarch, Pausanias the guide-book writer, Dio Chrysostom and Apollonius the preachers. Africa produced a novelist in the mysterious quack-magician Apuleius. Spain sent forth a whole galaxy of talent in the two Senecas, Martial, Lucan, and Quintilian. The younger Seneca, Nero’s complacent tutor, is perhaps the most typical figure in the literature of the principate. Trained as a rhetorician, like all the men of his day, his literary work consists of rhetorical drama and rhetorical philosophy, including some rhetorical science. No writer has ever attained to such a position of wealth and honour by the exercise of his pen. It cannot be said that Seneca’s position was gained without defilement, or that it brought him happiness. He was largely responsible by his weak compliance for the deterioration of character in his imperial pupil. If so, it brought its own retribution, for Nero drove him to suicide. Though Seneca’s tragedies are neglected to-day, they formed the connecting-link between Euripides and the stage of the Renaissance.