158 CERITE. 



several parts of pure sugar is ignited, and the mass, 

 while hot, introduced into a tube of very hard glass, in 



Fig. 16. 



which it is heated to full redness, while a stream of dry 

 chlorine gas is passed over it. The chloride of silicon 

 passes off as gas, while the chloride of zirconium sub- 

 limes in the cooler part of the tube. 



87. CERITE.* 

 2 (CeO, LaO, DiO), Si0 2 -f HO. 



Cerite, in fine powder, is treated with concentrated 

 sulphuric acid, with which it is digested, until the 

 high temperature produced by the combination has 

 caused it to form a dry mass. 



Cold water is then poured over it, and the mix- 

 ture allowed to digest, in the cold, until the sulphates 

 are dissolved. The solution filtered from the silica, 



* Only to be found in one locality the mine of Bantnas, near 

 Riddarhytta in Westuianland. May be obtained from dealers in 

 Minerals, or from Stockholm. 



