London, Wellcome Institute MS. 874. 176 folios. 205x150mm. 18th Century. Epistolae alchemicae. Opus de lapide philosophico. Praeloquium. Tractatus Isaacci Hollandi. [Followed by various medical, iatrochemical, and alchemical receipts, and a long tract on the Powder of Sympathy. In Latin, French and Italian, with a few entries in Spanish.] [Illustrated with a few rough pen-drawings of alchemical apparatus.] f49 'Cascoviae nonis Februarii, 1741.' [This is probably Kaschua (formerly Kassa) in Czechoslovakia.]