C; Sot 3 



fufion, but gives the (lone a dark, and fometimes 

 a deep black colour, which always is the character 

 of iron. A Miner a ferri calciformis pur a cryftal- 

 lifata, is commonly of a red colour : -This being 

 expofed to the flame, becomes quite black, and is 

 then readily attracted by the loadftone, which it 

 was not before. Befides thefe figns, the iron dis- 

 covers itfelf, by tinging the flag of a green trans- 

 parent colour, inclining to brown, when only a 

 little of the metal is fcorified ; but as foon as any 

 larger quantity thereof is diflblved in the flag, this 

 becomes firft a blackifh brown* and afterwards 

 quite black and opaque. 



SECT. XLVIL 



a 



Bifmuth is known by its communicating 

 yellowifh brown colour to borax : and Arfenic 

 by its volatility, and garlick fmell. Antimony, 

 both in form of regulus and ore, is wholly 

 volatile in the fire, when it is not mixed with 

 any other metal (except arfenic), and is known 

 by its particular fmell ; eafeer to be diftinguifhed, 

 when once known, than defcribed. When the ore 

 of antimony is melted upon the charcoal, it bub- 

 bles conftantly, during its volatilising. 



SECT. XLVIL 



Zinc ores are not eafily tried upon the coil 

 (Sect, xxxiii.). But the regulus of zinc, ex- 

 pofed to the fire upon the charcoal, burns with 

 a beautiful blue flame, and forms itfelf alrnolt iii- 

 itantly into white flowers, which are the common 

 flowers of zinc. 



SEC Tt 



