On mentioning this circumstance to his visitor, he explained that the powder should have been enclosed in wax before it was thrown into the molten lead, to prevent the fumes of the lead from affecting it. He added that he would come back next day, and show him how to make the projection; but as he failed to appear, Helvetius, in the presence of his wife and son, put six drachms of lead into a crucible, and as soon as the lead was melted, flung into it the atoms of powder given to him by his mysterious visitor, having first rolled them up in a little ball of wax. At the end of a quarter of an hour he found the lead transmuted (so he avers) into gold. Its colour at first was a deep green; but the mixture, when poured into a conical vessel, turned blood-red, and, after cooling, acquired the true tint of gold. A goldsmith who examined it pronounced it to be genuine. Helvetius requested Purelius, the keeper of the Dutch Mint, to test its value; and two drachms, after being exposed to aquafortis, were found to have increased a couple of scruples in weight-an increase doubtlessly owing to the silver, which still remained enveloped in the gold, despite the action of the aquafortis.
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