in the Pyrites. 191 



countries, as Poland, Hungary, Spain, and the In- 

 dies, but as it is alio found in feveral parts of Ger- 

 many, as Bohemia, Franconia, and Weftphalia. 

 The heavier it is, it imparts the more a greater in- 

 crcafe in weight, and a higher tint to the copper. 

 It affects a loamy, cJaiey, fat bottom; and fuch 

 earths have even properties, manifefting; a no fmali 

 degree of affinity with calamy 5 it therefore lies not 

 very deep, its mother-earth appearing commonly 

 juft under the turf, nay, conflicting the up^ermoft 

 layer, as at Tfcheren, near Commodau, in Bohe- 

 mia, where it may be taken up at the day. This 

 Bohemian fort yields (1.) an iron-vitriol, as an actual 

 iron-ftone alfo breaks amongft it; (2.) alum, a fa- 

 mous alum-work lying near the above place ; and, 

 I doubt not, but all calamy -ftone in general do the 

 like ; but if you give it copper, a great part of the 

 earth of the calamy incorporates with it, and afTumes 

 a metallic form and property; from hence it may 

 be known, that brafs, into which about a third of 

 its earth is introduced, will endure the being worked 

 like any fine copper. 



Calamy furnace-fragment, or cadmia fornacum y 

 I have already confidered, fo far as it included ar- 

 fenical particles ; but muft here again take it up, 

 becaufe its nature and effects are entirely zinky. 



Hither is chiefly referable what with us not only 

 hangs in the upper parts of the furnace, but which 

 a!fo looks bright, particularly yellow and whitifh* 

 being tender, and not run together ; alfo what fet- 

 tles externally over the fore- wall or breaft of the 

 furnace, between the chinks or openings of the 

 ftone, and the whole of that lower, mock-leady, 

 flaggy, crude-floney, caked matter, which, in the 

 courfe, of working the furnace, being ftill foft, is 



beat 



