190 Of the Arsenic 



of one and the fame virtue, or have one and the 

 fame materia prima, to tinge copper withal ! or, 

 who could think it poilible to educe fuch a matter 

 from tin, without any addition of calamy, zink, 

 and cadmia fornacum ? Here I cannot omit tran- 

 fcribing Lohneifs's * account , a confiderable me- 

 tallurgift of the Hartx, from which place alone 

 zink comes to us : and though we might expect 

 from him the bed account of it, yet it happens to 

 be concife enough, and fomething fuller and more 

 explicit, both on the origin of zink, and on the 

 Rammeljberg ores, fit for the purpofe, were to be 

 wifhed for. 4 In the courfe of the fmelting, (fays 

 c he) a fort of metal, there called zink, or Contre- 

 c fait, collects below in the chinks of the fore-wall, 



* or breaft of the furnace, where not covered thick 



* over, between the fhiver, or flate, of which it is 



* built. Upon knocking on the wall, this metal, 

 c which is white, like tin, yet harder, and more 



* malleable, and tingling like a little bell, runs out 

 ' into a trough placed underneath. The quantity 

 c procured at a time is in proportion to the care 

 c employed in collecting it. They fometimes get 

 ' to the quantity of two pounds, at other times, 



* not quite three or four loths.' 



Foflile calamy, lapis calaminaris, called alfo cad- 

 mia fqffilis ; under which laft appellation we muft 

 not include the cadmia called cobald, yielding fmalt ; 

 and which by way of diftinclion, both from that other 

 cadmia, and other cobaldifh, namely, arfenical 

 ores, is called cadmia pro caruleo. Calamy is a 

 Hone, or often a fort of ftoney earth only, fome- 

 times yellowifh, fometimes brown, and fometimes 

 a brown red ; not only as it comes to us from other 



countries, 

 * Berg bach, p. 83. 



