British Library MS. Sloane 2599. Paper. Folio. 49 folios. Beginning of 18th Century. 1. A work in cipher, entitled 'Liber misteriorum sextus et sanctus' with tables [Parts of Dr Dee's work on Angels, copied from MS. Sloane 3189.] ff. 1-45. 2. Preface and notes by John Michael Faustius, to the 'Introitus apertus ad occulsum Regis Palatium, a Philaletha', discussing the subject of the real name and the country of the author Philalethes. ff.46-49.