No longer is Salerno alone to produce illustrious physicians, or Bologne illustrious jurists. A "Rosa Anglica," the work of John of Gaddesden, court physician under Edward II., has the greatest success in learned Europe, and teaches how the stone can be cured by rubbing the invalid with a paste composed of crickets and beetles pounded together, "but taking care to first remove the heads and wings."[299] A multitude of prescriptions, of the same stamp most of them, are set down in this book, which was still printed and considered as an authority at the Renaissance. Bartholomew the Englishman,[300] another savant, yet more universal and more celebrated, writes one of the oldest encyclopedias. His Latin book, translated into several languages, and of which there are many very beautiful manuscripts,[301] comprises everything, from God and the angels down to beasts. Bartholomew teaches theology, philosophy, geography, and history, the natural sciences, medicine, worldly civility, and the art of waiting on table. Nothing is too high, or too low, or too obscure for him; he is acquainted with the nature of angels, as well as with that of fleas: "Fleas bite more sharply when it is going to rain." He knows about diamonds, "stones of love and reconciliation"; and about man's dreams "that vary according to the variation of the fumes that enter into the little chamber of his phantasy"; and about headaches that arise from "hot choleric vapours, full of ventosity"; and about the moon, that, "by the force of her dampness, sets her impression in the air and engenders dew"; and about everything in fact. The jurists are numerous; through them again the action of Rome upon England is fortified. Even those among them who are most bent upon maintaining the local laws and traditions, have constantly to refer to the ancient law-makers and commentators; Roman law is for them a sort of primordial and common treasure, open to all, and wherewith to fill the gaps of the native legislation. The first lessons had been given after the Conquest by foreigners: the Italian Vacarius, brought by Theobald, Archbishop of Canterbury, had professed law at Oxford in 1149.[302] Then Anglo-Normans and English begin to codify and interpret their laws; they write general treatises; they collect precedents; and so well do they understand the utility of precedents that these continue to have in legal matters, up to this day, an importance which no other nation has credited them with. Ralph Glanville, Chief Justice under Henry II., writes or inspires a "Treatise of the laws and customs of England"[303]; Richard, bishop of London, compiles a "Dialogue of the Exchequer,"[304] full of wisdom, life, and even a sort of humour; Henry of Bracton,[305] the most renowned of all, logician, observer, and thinker, composes in the thirteenth century an ample treatise, of which several abridgments[306] were afterwards made for the convenience of the judges, and which is still consulted.