152 Scientific Intelligence. [August, 



we suppose that the sugar is so enveloped in the other ingre- 

 dients that it escapes the ordinary means of detection. 



XVI. Analysis of the Kupfernickel. By Prof. Stromeyer. 

 Professor Stromeyer has been making an analysis of the 

 kuppernickel of Riegelsdorf, in Hesse, with the following 

 result : 



Arsenic 54*726 



Nickel, with a slight admixture of cobalt. . 44-206 



Iron 00-337 



Lead 00-32 



Sulphur 00-401 



100-000 



From this it appears that the essential constituents of kupfer- 

 nickel are arsenic and nickel. This is further confirmed by an 

 analysis, by the same chemist, of the nickel ochre, which, in 

 some cases at least, originates from the spontaneous decompo- 

 sition of kupfernickel. 



Oxide of nickel, with a trace of cobalt .... 37-35 



Arsenious acid 36-97 



Water 24-33 



Oxide of iron 1*13 



Sulphuric acid 0-23 



100-00 



Hence the former of these minerals is a native alloy of arsenic 

 and nickel, and the latter is arsenite of nickel. 



XVII. On the new Metal Cadmium. By M. Gay-Lussac* 

 The new metal resembles tin in its colour, its lustre, its soft- 

 ness, its ductility, and the sound which it produces when it is 

 bent. It melts and volatilizes at a temperature a little lower than 

 zinc. It preserves its splendour in the air ; but by heat it is 

 changed into an orange yellow oxide, which is not volatile, and 

 which is very easily reduced. This oxide does not colour borax ; 

 it dissolves very readily in acids, and forms colourless salts, 

 from which it is precipitated white by alkalies. The hydrosul- 

 phuric acid precipitates it yellow, like arsenic. Zinc precipitates 

 it in the metallic state. Its specific gravity at 77° (P.) is 8-635. 

 The metal was discovered in the autumn of the last year, by 

 M. Stromeyer, while he was officially examining the apotheca- 

 ries' shops at Hanover. M. Hermann, who prepares this oxide 

 on the great scale for medicinal purposes, having been prohi- 

 bited from selling it (because the presence of arsenic had been 

 supposed to have been detected in it) particularly examined it, 

 and perceived that it contained a new body, which he procured 



* Ann. de Chim. et de Phys. viii. 100. (May, 1818.) 



