London, Wellcome Institute MS. 4317. 1 folio + 220 pages. 20th Century [c. 1905.] Alexius von Ruesenstein. Ruesenstein's chymical writings. Arcanum Ruesensteinianum. [Appears to be a transcript of a translation made by Rev. W. A. Ayton. There is also an inserted transcript 'An attempt to ascertain the chemical meaning of the Reusenstein MS. Processes...']