SILVER. 



parts of sulphuret. This sulphuret was com- 

 posed of 



Silver 10 or 13-75 

 Sulphur 1-49 - 2-0487 



These experiments very nearly agree with each 

 other 5 yet I am satisfied that the quantity of 

 sulphur is somewhat overrated ; it is difficult to 

 say from what cause. 



Vauquelin,* who formed the sulphuret of sil- 

 ver in the same way, found it composed of 



Silver 100 or 13-75 

 Sulphur 14-59 - 2-0061 



In this experiment, the excess of sulphur is only 

 the eighth part of what existed in the sulphuret 

 prepared by Berzelius. 



Klaproth analyzed the native sulphuret of sil- 

 ver in the year 1793, at a time when minute ac- 

 curacy in chemical analyses was not attempted* 

 From 100 grains of the sulphuret, he obtained 

 112 grains of chloride of silver, equivalent to 

 84*383 grains of silver, and likewise H grain of 

 sulphate of silver, equivalent to 1O44 grain of 

 silver.t From this analysis, it follows, that sul- 

 phuret of silver is composed of 



Silver 85-427 or 13-75 

 Sulphur 14-573 - 2-3459 



100-000 



' Ann. de Mus. d'Hist, Nat. XVII. 1G. f Beitrage, I. 162. 

 Ee2 



