474 GOLD, PLATINUM, PALLADIUM, & c . 



Ammonia, 



Potash, 



Soda, 



Lime^Water, 



JSarytes water, 



Sulphuretted hydrogen, 



Protosulphate of iron, 



Sulphate of zinc. 



Zinc or tin, when left in the liquid, renders it 

 colourless in twenty-four hours. 



The following bodies produce no alteration in 

 the colour and transparency of this liquid. 



Blue vitriol, 



Persulphate of iron, 



Muriate of manganese, 



Nitric acid, 



Oxalic, tartaric, citric, acetic acids, 



Sulphuric, nitric, muriatic acids. 



When nitrate of mercury is dropped into the 

 solution of muriate of iridium, an abundant 

 precipitate of orange flocks falls down, and the 

 liquid becomes colourless. Muriate of tin pro- 

 duces a slight yellow precipitate, and renders 

 the liquid colourless. 



Such are the effects of reagents upon this sin- 

 gular substance. It is not precipitated either by 

 alkalies or by acids so that no good method of 

 analyzing it readily presents itself. Yet, upon 

 making the trial, I found the analysis of it both 

 easy and satisfactory. 



