British Library MS. Sloane 3008. Paper. Quarto. 70 folios. 15th Century. 1. Tractatus alchymicus, cui titulus, Rex Artus. f1. Begins: 'Magister Expertivus Grecie et Marochie Episcopus, cujus fama-'. ff.1-65. 2. Tractatus de Arte notoria, cum figura Theologiae. f.66. Begins: 'Salve, virgo, Mater trinitatis-'.