the uninitiated as an inferior metal, and very easily transmuted it into fine sonorous gold again with the aid of a little aquafortis.
Others imposed by means of nails, half iron and half gold or silver. They pretended that they really transmuted the precious half from iron, by dipping it in a strong alcohol. M. Geoffroy produced several of these nails to the Academy of Sciences, and shewed how nicely the two parts were soldered together. The golden or silver half was painted black to resemble iron, and the colour immediately disappeared when the nail was dipped into aquafortis. A nail of this description was, for a long time, in the cabinet of the Grand Duke of Tuscany. Such also, said M. Geoffroy, was the knife presented by a monk to Queen Elizabeth of England; the blade of which was half gold and half steel. Nothing at one time was more common than to see coins, half gold and half silver, which had been operated upon by alchymists, for the same purposes of trickery. In fact, says M. Geoffroy, in concluding his long report, there is every reason to believe that all the famous histories which have been handed down to us about the transmutation of metals into gold or silver, by means of the powder of projection or philosophical elixirs, are founded upon some successful deception of the kind above narrated. These pretended philosophers invariably disappeared after the first or second experiment, or their powders or elixirs have failed to produce their effect, either because attention being excited they have found no opportunity to renew the trick without being discovered, or because they have not had sufficient gold dust for more than one trial.
The disinterestedness of these would-be philosophers looked, at first sight, extremely imposing. Instances were not rare in which they generously abandoned all the profits of their transmutations—even the honour of the discovery. But this apparent disinterestedness was one