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.
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.
Practical Treatises: Theophilus, Diversarum artium schedula (12th cent.), (see Quellenschriften fiir Kunstgeschichte, VII., Vienna 1877); Cellini, Trattati dell' oreficeria e della scultura (ed.