*94 Of the Arse nic 



druggifts and phyficians, only a calx, or flowers <rf 

 burnc calamy-ftone and zink, or the woolly, white, 

 tender powder, arifing and collected from the pre- 

 paration of calamy or zink, for brafs or bronze- 

 metal, or barely with this intention, and thus quite 

 free both from arfenk, or other foreign admixture •, 

 as Pomet, an author deferving more credit and 

 commendation than moft writers on natural hiftory, 

 has truly hinted. Hither again may be referred the 

 abovementioned nihilum from fmelting huts, after 

 culling and thoroughly burning it, in order to purge 

 it from the arfenic, though fcarce equalling the 

 other in tendernefs and purity: yet neither are ca- 

 lamy, nor zink flowers, and a foffii marl, one and 

 the fame in nature and effects: nor again, are marls 

 one and the fame, as I once found a fort, fold for 

 a nihilum, to be arfenical. 



Pomet writes as follows : c Pompholyx, white ca- 

 c lamy, white nothing, and ore-flowers, erroneoufly 

 € called metal-ajh, is what adheres, in the courfe of 



* fmelting for brafs, to the cover of the crucible, 



* and the fmeltet's forceps •, for, it is certain, that 

 c neither bell-metal, nor the metal, nor the potin 

 c (a kind of brafs whereof pots are often made; but 

 ' brafs alone, yield the genuine nihilum, though 

 6 moft writers have thought otherwife ; there being 

 6 naturally nothing befides brafs, or yellow copper, 



* that yields the white calamy, ox pompholyx. But 



* though pompholyx may be eafily found, yet no 



* one thing, either through the ignorance or negli- 



* gence of apothecaries, is more unknown •, in re- 



* gard moft of them are of the opinion, pompholyx 

 ' and tutty, having one and the fame virtue, may 

 1 be fubif ituted the one for the other. The moft 



* beautiful pompholyx comes from Holland -, not 



* thar it is really a better fort, but only on account 



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