British Library MS. Sloane 3762. Paper. Duodecimo. 158 folios. 17th Century. 1. A dialogue of Egidius de Vadis between Nature and the disciple of philosophy, of the searching out of the Philosophers' Stone. ff.2-21. Begins: 'After that I had many yeares wearied myselfe with labour'. Printed in Latin in Theatrum Chemicum, Vol II, p.85. Another copy in MS. Sloane 3772. 2. The third principle of minerals, by Sandivogius. ff.22-29. Printed in German, 8vo, Amst. 1656. 4. The letter of Theodorus Mundanus to Edmund Dickenson in reply to his on the quintessence of the Philosophers; translated from the latin by Edmund Brice. ff.32-63. [Printed in Latin, Octavo, Oxon. 1686.] 6. Alchemical extracts from various authors, some processes and notes. ff.74-88.