The Saxon translation of the Περὶ Διδαξέων (Harl. 6258) is a thin volume badly mutilated in parts. Herr Max Löwenbeck[10] has shown that this is in part translated from a treatise by an eleventh-century writer, Petrocellus or Petronius, of the School of Salerno--the original treatise being entitled _Practica Petrocelli Salernitani_.[11] As has been pointed out by many eminent authorities, the School of Salerno, being a survival of Greek medicine, was uncontaminated by superstitious medicine. Consequently there are striking differences between this and the other Saxon manuscripts. The large majority of the herbs mentioned are those of Southern Europe, and the pharmacy is very simple compared with the number of herbs in prescriptions of native origin. As Dr. J. F. Payne[12] has pointed out, Herr Löwenbeck's important discovery does not account for the whole of the English book. The order of the chapters differs from that of the Salernitan writer; there are passages not to be found in the _Practica_, and in some places the English text gives a fuller reading. It is fairly evident that the Saxon treatise is at least in part indebted to the _Passionarius_ by Gariopontus, another Salernitan writer of the same period. The _Lacnunga_ (Harl. 585), an original work, and one of the oldest and most interesting manuscripts, is a small, thick volume without any illustrations. Some of the letters are illuminated and some are rudely ornamented. At the top of the first page there is the inscription "Liber Humfredi Wanley," and it is interesting, therefore, to realise that the British Museum owes this treasure to the zealous antiquarian whose efforts during the closing years of the seventeenth and early years of the eighteenth century rescued so many valuable Saxon and other MSS. from oblivion.[13]