British Library MS. Sloane 1185. Paper. In small Octavo. 49 folios. 17th Century. Bound with MSS. Sloane 479 and 2225. In the hand of Master Theodor Mayerne. 1. de lapide philosophorum exerpta ex auctoribus variis, sub titulo Mysterium Naturae. ff.1-30. 2. Turba philosophorum alchymicorum in argumentum quod 'Argentum vivum est aurum immaturum et indigestum'. ff.31-49.