2io Of the Arsenic 



yellow metals, a difference no way groundlefs ; but 

 there are middle metals, and thefe ftand ranged 

 with the intermediate quickfilver, and arfenic cer- 

 tainly mould not have been excluded. 



(7) The fugitive portion of the white pyrites 

 is almoft as well affected and inclined to iron as to 

 bifmuth, tin, and zink ; whereas regulus of anti- 

 mony, and lead, are ill affected and unfriendly 

 thereto ; feeing the latter can at no rate bear it 

 nor run together with it, even when dead, or reduced 

 to a glafs. The former, indeed, unites with it at 

 length, but deftroys it : for the magnet, as above 

 mentioned, touches not the iron, that is fmelted 

 with regulus ; whereas it has the lead averfion 

 pofTible to arfenic^ tin, zink, and bifmuth, even 

 ihould the iron happen to be ftrongly dofed 

 with them. 



(8.) White pyrites holds no fulphur, nor any 

 fandarach. 



, (9.) It fmells in the fire like garlick j its fmcll is 

 biting- (harp or pungent. 



■^ (10.) It diffufes its fmell in the air to a greater 

 diftance than fulphur does, 



(11.) In the ftrongeft degree of fire it leaves a 

 black glafs behind, as we experience of any other 

 iron mineral. 



(r2.) Arfenic makes copper white, but at the 

 fame time brittle. 



(13.) It leaves iron its colgur, and makes it 

 eager alfo, 



(14.) The 



