was convinced of the possibility of finding the philosopher’s stone, and ready to assist any adventurer either zealous or impudent enough to pretend to it.
After Borri had been about eleven years in confinement, a small volume was published at Cologne, entitled The Key of the Cabinet of the Chevalier Joseph Francis Borri, in which are contained many curious Letters upon Chemistry and other Sciences, written by him, together with a Memoir of his Life. This book contained a complete exposition of the Rosicrucian philosophy, and afforded materials to the Abbé de Villars for his interesting Count de Gabalis, which excited so much attention at the close of the seventeenth century.
Borri lingered in the prison of St. Angelo till 1695, when he died, in his eightieth year. Besides The Key of the Cabinet, written originally in Copenhagen, in 1666, for the edification of King Frederick III., he published a work upon alchymy and the secret sciences, under the title of The