434 ZINC, CADMIUM, LEAD, c. 



which were made soon after Mr. Faraday had 

 published his observations, were upon too small 

 a scale. My object was merely to verify Mr. 

 Faraday's statement ; but as far as I went I ob- 

 tained just the s<ame results as had been stated 

 by that chemist. This oxide then, which may 

 be called a suboxide, would seem to be a com- 

 pound of 



l atom silver = 20-625 

 1 atom oxygen = 1 



21-625 



This suboxide does not appear to form distinct 

 salts with acids. 

 Suiphuret 4,. The sulphuret of silver furnishes an addi- 



of silver. A . . . 



tional evidence that the atomic weight or this 

 metal is 13*75. This sulphuret, which is a black 

 looking compound, possessed of some ductility, 

 and quite sectile, may be formed by stratifying 

 silver and sulphur in a covered crucible, and 

 heating the mixture till the excess of sulphur is 

 driven off. Berzelius made two experiments in 

 this way.* In the first, 2-605 parts of silver be- 

 came 2-993 parts of sulphuret. Here we have 

 the sulphuret composed of 



Silver 2-605 or 13-75 

 Sulphur 0-388 - 2-048 



In the second, 10 parts of silver became 11-49 



* Ann. de Chim. LXXIX. 131. 



