Beyond the field of law, such prose as was written in this century was mainly Greek. The historical works of Herodian and Dio Cassius, poor in quality as they are, seem to have excelled anything written at the same time in Latin. Their contemporary, Marius Maximus, continued the series of biographies of the Emperors begun by Suetonius, carrying it down from Nerva to Heliogabalus; but the work, such as it was, is lost, and is only known as the main source used by the earlier compilers of the _Augustan History_. Verse-making had fallen into the hands of inferior grammarians. Of their numerous productions enough survives to indicate that a certain technical skill was not wholly lost. The metrical treatises of Terentianus Maurus, a scholar of the later years of the second century, show that the science of metre was studied with great care, not only in its common forms, but in the less familiar lyric measures. The didactic poem on the art of medicine by Quintus Sammonicus Serenus, the son of an eminent bibliophile, and the friend of the Emperor Alexander Severus, though of little poetical merit, is written in graceful and fluent verse. If of little merit as poetry, it is of even less as science. Medicine had sunk lower towards barbarism than versification, when a sovereign remedy against fevers was described in these polished lines:-- _Inscribis chartae quod dicitur Abracadabra, Saepius et subter repetis, sed detrahe summam Et magis atque magis desint elemenfa figuris, Singula quae semper rapies et cetera figes Donec in augustum redigatur litera conum: His lino nexis collum redimire memento_. Nor is his alternative remedy of a piece of coral hung round the patient's neck much more rational. The drop from the science of Celsus is much more striking here than the drop from the art of Celsus' contemporary Manilius. An intermittent imperial patronage of letters lingered on. The elder and younger Gordian (the latter a pupil of Sammonicus' father, who bequeathed his immense library to him) had some reputation as writers. Clodius Albinus, the governor of Britain who disputed the empire with Septimius Severus, was a devoted admirer of Apuleius, and wrote romances in a similar manner, which, according to his biographer, had no inconsiderable circulation.