British Library MS. Sloane 3772. Paper. Duodecimo. 58 folios. 17th Century. 1. 'A dialogue of Egidius de Vadis between Nature and the Disciple of Philosophy, of the serching out of the Philosophers' Stone'. Signed at the end. J.G. [16]88. ff.1-31. [Prefixed is a list of the Authors out of which the work is extracted. The Latin text is in MS. Sloane. 1799. art. 1. Printed in Latin, in the Theatrum Chemicum, Vol. II. p.85.] 2. 'The Practic of Alchymica of the Prophetess Mary Moysis sister'; translated out of the German tongue. ff.31b-37. Begins: 'The great Philosopher Aros coming to the Prophetess Mary'. 3. Chymical receipts. ff.38b.-41, 45-47. 4. The whole mystery of Chymistry, with a table of the characters employed. ff.42b-44. 5. The testament of J.G.M. in which is declared the secret of the transmutation of metals. ff.48-58. A letter is prefixed, inscribed: 'To my loving Cozen and son the true Hermetick Philosopher. J.H.N.O.' Begins: 'Altho I had resolved nevre to give in writing to any person the secret of the ancient sages'. The treatise begins: 'In the name of God take of the cleanest and clearest sea salt, so as tis made by the heat of the sun'. Ends: 'therefore allso I have subscribed this Testament with my blood, the last day of my life, on my death bed. Actum Leyden, 27 of March, 1672, J.G.M.'