London, Wellcome Institute MS. 1297. 460 folios. 195x135mm. [Perugia.] 18th Century [c. 1700.] Julius de Boncambis. Libro lettera O. A collection of alchemical, chemical and medical receipts, processes, and 'secrets', in Italian and Latin. Illustrated with a few rough pen drawing of alchemical apparatus. f1v, 57v and 68 have full page symbolic drawings. The short receipts are mainly alchemical, but include entries on glass-making and artificial gems. f1-67 Annotationes circa medicinam universalem, seu Aurum potabile et Lapidem physicum. f252-277 Il modo nel quale si possono fare Fiore d'ogni sorte simili alle naturale et cauarle da ogni sorte de metalli... f335v-367v La corona della rossa Croce. f413-419 Positiones de complemento artificii philosophici vel Magisterio Hermetis. f443v-458 Lapis del quinternetto del Pietro Rossi.