the Pyrites. 375 



XXI. To (hew the volatilifation of metals, Mr. 

 Eoyle alledges the following experiment : if you 

 diftil thin copper-plates with an equal, or twice the 

 quantity of mercury fublimate, there remains feme- 

 thing below, running, and inflammable* like Spa- 

 nifh or fealing-wax, which being powdered and ex- 

 pofed to the air, then faturated with fpirit of fait j 

 yields fomething like a verdigreafe ; and this, a- 

 gain, diftilled with tripoly, or the like, gives a 

 clear liquor, like fpring-water, which turns green 

 with fal ammoniac, or a volatile fait §. 



XXII. Swedenberg has, in a prodromus^ at- 

 tempted to difcover, in a geometrical way, and by 

 the hydrodatical balance, the nature of bodies ; but 

 fuch conclufions, however, appear to me to be pre- 

 mature, it being necelTary, firlt of all, not only to 

 repeat and verily feveral, but, much more fo, to 

 make new experiments. 



XXIII. In the Salberg-groove, in 1696, fome 

 running quickfilver was found, but never at any 

 other time-, alio once, fome in Lapland §§. 



XXIV. As I was concluding this impreffion, I 

 had fome pyrites fent me from Alonitz, in Ruflla, 

 of which I (hall only fay, that it differs not from 

 other pyrites. The copper-ore in the SchinifeJgi- 

 groove, which is lafulous, holds forty five pounds 

 of black copper. At the groove Bogatvi Mednoi 

 Jamii, alfo at the Ninifelgi Knordu, there breaks 

 a fine quartz with native copper : and which is very 

 remarkable, in the diftrict of Nerzinfkoy, in the 

 groove Bajatky, there is found a fine-grained glit- 

 ter, or galena, containing eighty five pounds of 

 and four loths of filver. 



XXV. Take one pound of marcafita aurea^ fays 

 Mazotta **, and diffolve it in two pounds of de- 



\ Boyle on the wholefomenefs of the air, part' 



K^ Leopoldi relatio de irinere fuecico., p, 81. 

 ** be tri^lki philofophia, p. 202. 



