He prepared a new edition of the monk Theophilus's celebrated treatise, Diversarum artium schedula, and for several years devoted his Saturday mornings to laboratory research with the chemist Aline Girard at the Conservatoire des Arts et Metiers, the results of which were utilized by Marcellin Berthelot in the first volume (1894) of his Chimie au moyen dge.
We have in the work of the monk Theophilus, Diversarum artium schedula, and in the probably earlier work of Eraclius, about the iith century, instructions as to the art of glass-making in general, and also as to the production of coloured and enamelled vessels, which these writers speak of as being practised by the Greeks.
Later we find a potestas within the city, elected for a year and assisted by seven councillors and seven rectores super capitibus artium.
After 1282 the signoria was composed of the 3 (afterwards 6) priori of the gilds, who ended by ousting the buoni uomini, while a defensor artificum et artium takes the place of the capitano; thus the republic became an essentially trading community, governed by the popolani grassi or rich merchants.
The most important of his treatises is the De Causis corruptarum Artium, which has been ranked with Bacon's Organon.
See Spengel, Artium scriptores, pp. 45 sqq.
The first group includes his Exponabilia (1503), his commentary on Petrus Hispanus (1505-1506), his Inclitarum artium libri (1506, &c.), his commentary on Joannes Dorp (1504, &c.), his Insolubilia (1516, &c.), his introduction to Aristotle's logic (1521, &c.), his commentary on the ethics (1530), and, chief of all, his commentary on Peter Lombard's Sentences (1509, &c.); the second consists of a commentary on Matthew (1518) and another on the Four Gospels (1529); the last is represented by his famous Historia Majoris Britanniae tam Angliae quam Scotiae J.
Receipts given in the Leiden papyrus reappear in the Compositiones ad Tingenda and the Mappae Clavicula, both workshop receipt books, one known in an 8th-century MS. at Lucca, and the other in a loth-century MS. in the library of Schlettstadt; and again in such works as the De Artibus Romanorum of Eraclius and the Schedula Diversarum Artium of Theophilus, belonging to the 11th or 12th century.
Moreover, Erigena again and again declares that dialectic has to do with the stadia of a real or divine classification: " Intelligitur quod ars ilia, quae dividit genera in species et species in genera resolvit, quae X dicitur, non ab humanis machinationibus sit facta, sed in natura rerum ab auctore omnium artium, quae verae artes sunt, condita et a sapientibus inventa " (De divisione naturae, iv.
Practical Treatises: Theophilus, Diversarum artium schedula (12th cent.), (see Quellenschriften fiir Kunstgeschichte, VII., Vienna 1877); Cellini, Trattati dell' oreficeria e della scultura (ed.
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