London, Wellcome Institute MS. 2591. 8 folios + 184 pages + 130 pages. 195x160mm. 18th Century. [Grasshof, Johann.] Aperta Arca Arcani Artificiosissimi, or the Chest open and opened by the Great and Little Bauer. Of the greatest and most secret Mysteries of Nature, together with the right and veritable Physica Naturalis Rotunda, and thus made completly intelligible by the Chemico-Cabalistical Figure. Also: Cautions and Warning-Instructions and Proofs against all those who falsely persuade other people that they are able to prepare the Aurum Potabile without the Tincture of the Universal Lapis Philosophorum in less time by itself. Hamburg & Stockholm. 1687. With other Alchemical extracts. [The 'Aperta Arca' seems first to have been published under the title 'Der Kleine Baur' in a slightly different version, at Frankfort in 1617. It was included in Zetzner's 'Theatrum Chemicum' Vol VI, 1661 in Latin.] [The 'Cautions' were published originally as 'Warnung' at Cologne in 1607, and were possibly written by Franz, Krelle.] [The two translators are the Rev. W.A. Ayton, and C. W. Hoyland.] [See MS. Wellcome 2592.]