Page:Memoirs of Extraordinary Popular Delusions and the Madness of Crowds Vol 1.djvu/204

188, and he therefore gave Becher much of his praise, but none of his money. Becher afterwards tried the States-General of Holland with no better success.

With regard to the innumerable tricks by which impostors persuaded the world that they had succeeded in making gold, and of which so many stories were current about this period, a very satisfactory report was read by M. Geoffroy the elder, at the sitting of the Royal Academy of Sciences at Paris, on the 15th of April, 1722. As it relates principally to the alchymic cheats of the sixteenth and seventeenth centuries, the following abridgment of it may not be out of place in this portion of our history. The instances of successful transmutation were so numerous, and apparently so well authenticated, that nothing short of so able an exposure as that of M. Geoffroy could disabuse the public mind. The trick to which they oftenest had recourse was to use a double-bottomed crucible, the under surface being of iron or copper, and the upper one of wax, painted to resemble the same metal. Between the two they placed as much gold or silver dust as was necessary for their purpose. They then put in their lead, quicksilver, or other ingredients, and placed their pot upon the fire. Of course, when the experiment was concluded, they never failed to find a lump of gold at the bottom. The same result was produced in many other ways. Some of them used a hollow wand, filled with gold or silver dust, and stopped at the ends with wax or butter. With this they stirred the boiling metal in their crucibles, taking care to accompany the operation with many ceremonies, to divert attention from the real purpose of the manoeuvre. They also drilled holes in lumps of lead, into which they poured molten gold, and carefully closed the aperture with the original metal. Sometimes they washed a piece of gold with quicksilver. When in this state, they found no difficulty in palming it off upon 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