chemistry and the doctrines of the Rosicrucians. She even obtained permission that he should leave his prison occasionally for a day or two, and reside in her palace, she being responsible for his return to captivity. She encouraged him to search for the great secret of the alchymists, and provided him with money for the purpose. It may well be supposed that Borri benefited most by this acquaintance, and that Christina got nothing but experience. It is not sure that she gained even that; for until her dying day she 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 Mission of Romulus to the Romans.
INFERIOR ALCHYMISTS OF THE SEVENTEENTH CENTURY.
Besides the pretenders to the philosopher's stone whose lives have been already narrated, this and the preceding century produced a great number of writers, who inundated literature with their books upon the subject. In fact, most of the learned men of that age had some faith in it. Van Helmont, Borrichius, Kircher, Boerhaave, and a score of others, though not professed alchymists, were fond of the science, and countenanced its professors. Helvetius, the grandfather of the celebrated philosopher of the same name, asserts that he saw an inferior metal turned into gold by a stranger, at the Hague, in 1666. He says, that, sitting one day in his study, a man, who was dressed as a respectable burgher of North Holland, and very modest and simple in his appearance, called upon him, with the intention of dispelling his doubts relative to the philosopher's stone. He asked Helvetius if he thought he should know that rare gem if he saw it. To which Helvetius replied, that he certainly should not. The burgher immediately drew from his pocket a small ivory box, containing three pieces of metal, of the colour of brimstone, and extremely heavy; and
