from the Py rite $; 32$ 



confequently, is a thing dead and effete, no more 

 to be boiled for vitriol^ but thrown away as ufe- 

 lefs, 



Two queries ftill remain behind, viz. ( 1 .) Whe- 

 ther a vitriol may not alfo be arfenical, orpartake^ 

 of arfenic : The reafon of the query is, that pyrita 

 are not without arfenic. 



(2.) How the cafe holds with the vitriol and its 

 pyrites, alfo with the alcaline earth in medicinal 

 fp rings. 



A certain fpring, which I highly efteem, but 

 leave namelels, to prevent the entertaining any 

 prejudice againft, or difadvantageous opinion 

 about it, gives occafion to my firlt query. That 

 it is arfenical is plain, not only from the white 

 fublimate procured from it, but alfo from the ac- 

 tual arfenical odour, it ftrikes the nofe withal. 

 Yet, neither on this nor the other circumftance, 

 is any great flrefs to be laid at all times, efpe- 

 cially when the arfenic is in fo very fmall a . quan- 

 tity, as is the cafe here, that it cannot be fuffi- 

 ciently examined j for, phofphorus alfo gives forth, 

 an arfenical odour, which I have alfo fmelled from 

 a lead-procefs, where nothing arfenical, but falts 

 only were employed -, and falts, fuch as are in the 

 namelcfs water, may, in their mixed crude ftate, 

 volatilife a little, though not, in their feparated 

 flate, or not fo eafily without peculiar additions, 

 appropriations, &c. 



As pyrites generally contains arfenic, this arfenic 



' lodge in that fort from which the water may 



receive its mineral conftituent portion. The pojf- 



Ubility of the thing appears from the Fribcrg 



Y 3 fchlatkza- 



