Of changing Metals.

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dry it, and keep it in a place not moist, lest it melt; and mingle with it one poundot powder ef lead, and drew on of this powder six ounces for ev.cry pound of brassmade hot in a melting vessel ; and let them be shaken, and stirred vehemently withan iron thing to stir it with : when the vessel is cold, break it, you shall find alump of gold in the bottom. Do the rest as 1 laid.

Chap. X.

A compendious wap to part gold or silver from other Metals with aqua fortis.

TX/'E shall teach thus compendiously to part gold from silver, and silver from othermetals ; and it is no small gain to be got by it, isa man well understood whatI write: for 1 have known iome by this art that have got great wealth. For example,take a mixture of brass and silver, dissolve it in common aqua fortis : when it is con-sumed, cast fountain-water into it, to remove the sharpneis of the water, and thath can no more corrode the metal. Put the water into a great mouthed earthen ves-sel, and plunge plates of brass therein ; for the silver will stick to them like a cloud,the brass is best in the water: put the water into a glass retort with a large belly, andmake a soft fire under, and the fountain-water will distil forth by degrees. Whenyou know that the whole quantity of fountain-water is distilled out, or the belly ofthe retort looks of a yellow colour , and the sent of the salts pierceth your nostrils:take away the receiver, and put another that is empty to it, and lute it well that no-thing break forth. Augment the fire, and you snail draw off your aquafortis asstrong as before, and the brass will be at the bottom of the retort s The aquafortiswill be as good as it was, and you may use it oft-times.

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