96 On the Composition of Sulpkuret of Antimony. [Aug. 



of the sulphur will make its escape in the state of sulphureted 

 hydrogen gas. The result of Bergman's analysis was that native 

 sulphuret of antimony is composed of 



Antimony 71 100-000 



Sulphur 26 35-035 



100* 



Wenzel indeed, in his Verwandschaft, first published in 1"76, 

 had endeavoured to determine the proportion in which antimony 

 and sulphur combine, by heating these two bodies together in a 

 covered crucible, and ascertaining the increase of weight which 

 the antimony sustained. The result of this experiment was, that 

 his artificial sulphuret of antimony is composed of 



Antimony 77 100 



Sulphur 23 29 87 



100 



But this method is scarcely ever to be depended on, unless it be 

 attended with precautions, which Wenzel at the time when he 

 marie his experiments could not consider as necessary. 



Karsten, in his Mineralogieal Tables, published in Berlin in 

 1808, quotes no other analysis of this ore, except the one by Berg- 

 man which I have specified above : hence it would appear, that at 

 that period he was not aware of the existence of any other. No 

 analysis whatever is given by Ha"ty in his System of Mineralogy. 



In the Journal de Physique, lv. 325, Proust gives the result of 

 his experiments on sulphuret of antimony, and deduces from them 

 that it is a compound of 



Antimony 7 5 1^0 



Sulphur 25 33-333 



100 



Mr. John Davy, in his paper On the Combination of different 

 Metals with Chlorine, published in the Philosophical Transactions 

 for 1812, gives us sulphuret of antimony as a compound of 



Antimony 425 74-06 100 



Sulphur 14 86 2594 3496 



100-00 



Finally, Berzelius, in the second volume of his La'rbok i Ke- 

 mien, p. 162, published at Stockholm in 1812, states, without 

 giving any authority, from which one is disposed to consider it as 

 the result of his own experiments, that sulphuret of antimony is 

 composed of 



• Or-UiC. iii. 107. 



