1822.] Methodof analyzing the Ores of Nickel. 437 



it cannot be more soluble than one part in 56792, so near 

 approaching to insolubihty as to lead to the conclusion that Dr. 

 Clarke was in error. 



In one instance when subliming the pure metal, the top of the 

 glass tube was not closed, and it had been kept in the tire longer 

 than usual ; upon scraping out the sublimate, instead of metal, it 

 consisted of purple, opaque, radiating, needle formed crystals ; 

 imagining it to be a carburet, 1 threw it into muriatic acid, where, 

 itdissolved without effervescence, and left no residue; it, therefore^ 

 must have been a crystallized oxide, but whether the oxygen was 

 m a different proportion than hitherto found, I have not had time 

 to ascertain ; but as I am engaged at present in experiments upoiL 

 the metal, in a short time you will receive an account of any 

 thing which may be interesting. I cannot conclude without 

 offering an opinion as to the best mode of procuring it in suffi- 

 cient quantity to be useful in the arts. As the cadmium rises 

 earher than the zinc, the first products of the distillation must 

 contain more than the last ; if the tube was put up immediately 

 upon the pot being charged, and the hrst few pounds of zinc kept 

 separate, I have no doubt but the zinc smelter would find in it 

 enough to pay his expenses in subliming it ; in fact, the addi- 

 tional expense would be very trifling, as they do not sell the 

 zinc in the crude state in which it is found after distillation, but 

 always melt it into lumps ; this is done in an iron pot, by putting 

 an air-tight top to it, and increasing the heat, perhaps, 200°, 

 which may be done with little fuel, they would accomplish it^ 

 and thus be enabled to render the new metal at a price very little 

 higher than they do zinc. I remain. Sir, 



Your most obedient servant, 



William Herapath. . 



Article XII. 



On the Method of analyzing the Ores of Nickel, and on a nem 

 Combination of Nickel with Arsenic and Sulphur. By J. 

 Berzelius. 



(Concluded from p. 216.) 



III. Analysis of a fVhite Ore of Nickel from Loos, in Nelsing- 



land. 



This ore of nickel is not crystaUized ; it is a white brilliant 

 metallic mass, of a granular structure. There are two varieties 

 which are very difficultly distinguished from each other. In one 

 of these varieties, the grains are rounder ; it decrepitates in the 

 fire with extreme violence ; when heated in a glass tube closed 

 at one end, it leaves a mass resembling kupfernickel, and a por- 

 tion of sulphurot of arsenic subHmes. The other variety is also 



