22 On the apparent Convfrfion of Silver info Gold. 



it by the quart, you will be able to feparale a confiderable 

 quantity of gold, which was not before in it, becaufe you fe- 

 parated by the firft quartation all the gold it could contain. 

 Farther, diflblve 8 oz. of filver in aquafortis, feparate all 

 the undiflblvcd part, add to it common fait, and edulcorate 

 the precipitate vcu have obtained and dry it. Mix with it 

 half its weight of well puriiied regulus of antimony prepared 

 with iron, and diftil the whole in a retort over a flow fire. 

 About 3 oz. or mere of the butler (muriat) of antimony will 

 pafs over, and, when the fire has been ftrengthened to the 

 utmoft, the filver will remain with a part of the regulus at 

 the bottom of the retort. Fufc this filver in a crucible until 

 no more vapour arifes, and until all the regulus is evaporated. 

 Then fufc this filver once or twice more in new crucibles 

 with a little borax and faltpctre, and it will become much 

 more beautiiul and finer than cupelled filver. If you then 

 granulate this filver and difiblve it in aquafortis, a great many 

 black fcales will remain behind, and, on fufing, you will find 

 them to be gold, If you repeat this operation once more 

 with the fame filver and a like regulus, a few black flakes 

 only will remain ; and the third time there will be none*." 

 Boerhaave fays, in his Elements of Chemiftry, " If two parts 

 of the precipitated calx of fiber, well mixed by trituration 

 with one part of regulus of antimony, be diftilled in a retort 

 in a fand bath, pure butter of antimony, equal in weight to 

 the regulus added, will pafs over. The filver, with part of 

 the regulus, will remain at the bottom; and, when reduced, 

 always gives real gold f." Kunckel %, in like manner, ob- 



'' See Memoirc! de T Aeadcmif de Paris for the year 1709, p. T35 ; and 

 Ctell's Ntiuei Chcm. Arcbi'v. vol i, p. 30. 



f Si enim cilcis praBcipitatae nrgcnti p;irtcs dun?, cum reguli antimonii 

 parte una, tritu bene miHae diftillant ex retort^, igne arena.', prodit purvim 

 butyrum antimonii tanto pondere, quo fuit regulus admiftus. Argtntum 

 cum parte reguli manet in fundo, et rcdudum Jimpir dal 'vcrnm aurvm. 

 JJ.ltmenta Chemiy. Lipfi*, 1731. Tom. ii. p. 413, 



X See his Chrm. lrtt€}iJ.cin. p. 14C. 



tained 



