^8$ Natural Magick. Doo^ iS.

in a°ain, having measured a fixt parr, and he sound what certain quantity of wateranswered to the quantity cf the Silver: then he put in the lump of Gold into the fullvessel, and taking that forth, by the same reason he found that not so much waterran forth, butsomuthlessof the body of the Gold was less than the fame weight inSilver. Then he filled the vessel with water, and put in the Crown, and he foundthat more water ran forth by reason of the Crown, than for the mass of Gold of thefame weight, and from thence because more water run over by reason of the Crown,than for the Gold lump, he reasoned that there must be a mixture in the Crown. Thiswas the Greeks invention, that is worthy of praise, but the operation is difficult; forin things of small quantity the theft cannot be discerned, nor can this reason appearso clear to the eye , where the obsolute fashion of the vessel was wanting. Now away is invented how for all money, be it never so small, we can tell presently, andwe want not many instruments, that we may cry, We have overfonnded Vperenrek^yVpermreka, we have gone beyond Archimedes his Eureka. The way is this

To fynorv any part of Silver mingled with (fold .

Take a perfect ballance, and put in one scale any Metal, in the other as much of thefame Metal, but the purest of its kind; and when the scales hang evqp in the Air,put them into a vessel full of water, and let them down under water about half a foot:Then wiil it be a strange wonder, for the ballances that hang equal in the Air, willchange their nature in the water, and will be unequal: for the impure Metal will beuppermost, and the pure will sink to the bottom. The reason is, because pure Goldcompared with that kind, is heavier than all impure Gold, because pure Gold takethles? place; wherefore it will way heavior by the former reason. If then we wouldknow how much Silver is in that Gold , put as much pure Gold in theother scale, aswill make the ballances equal under the waters ; when they are equal take them up,and the weight you added under water, will be the weight of the mixture. If youwould know how much Gold is upon a vessel Gilded, put the Cup in one scale , andas much pure Silver in the other, that the scales may hang equal in the Air; then putthem into the water, and the vessel will sink down ; put into the other scale as muchpure Gold, as will make them equal under water, draw them forth, and that is theweight cf the Gilt of the plate: You shall do the same for Silver, Brass, Iron, whiteor black Lead. But would you know whether in Money, Brass be mingled withSilver, or Coin be adulterated with Copper; put the Money into one scale, and asmuch of the finest Silver into the other, ballance them equal; then put them underthe water, the Money will go down ; adde as much Brass as will make the scales equal,then take them forth, and it will be the weight of the mixture. Now will I set theweights of Metals,how much they weigh more in the waters, than in the Air,where-by without any other experiment we may know mixtures. An Iron*ball that weigh-ed nighteen ounces in the Air, will weigh fifteen in the waters; whence it is thata Ball of the same magnitude must owe three ounces to the water; wherefore theproportion of Iron in the Air to the same in the waters, is as fifteen to nineteen. ALeaden Bullet of the fame magnitude, weighs 31 ounces in the Air, in the water but-27: A Matblc Bullet little less for bulk, weighs 7 in the Air, and 5 in the water:Copper weighs 1 6 in the Air, and 12 in the waters: Silver weighs in the Air 125,in the waters 113 : Brass in the Air weighs 6 5 Karat?, and one grain, in the waters50 Karats and two stains: Crown Gold in the Air weighs 66 grains, in the waters62 : Gold called Zechini in the Air weighs 17 Karats, under water 16 Karats:Tnrkish Du at Gold weighs in the Air 34, under waters 3 2: Common French CrownGold weighs in the Air 67, under waters 60: Common Crown Gold of Hungarythat is old, in the Air weighs 17, in the water 1 6 : Crown Gold of Tirrary weighs1 6 in the Air, and 14 under water.

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