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This Treatise contains some of the Choicest Collections of the Famous Sir Kenelm Digby, some whereof have been wrought by his own hands, some communicated to him by Learned Men of all Nations. I had the Honour for several years to wait upon Sir Kenelm, and to have several of his Manu-scripts in my Custody. This choice manual contains rare and profitable Secrets in Philosophy and Chemistry, delivered with more perspicuity and plainness than is yet to be found in any Chymical Book."