272 M. Stromeyer's new Details respecting Cadmium. [Oct. 



The sulphate crystallizes in large rectangular prisms, trans- 

 parent, similar to sulphate of zinc, and very soluble in water. It 

 effloresces strongly in the air, and loses easily its water of crys- 

 tallization at a gentle heat. It is not decomposed without 

 difficulty by heat, and may be exposed to a feeble red heat with- 

 out undergoing any change. At a more elevated temperature, 

 it gives out its acid, and is converted into a subsulphate, which 

 crystallizes in plates, and which dissolves with difficulty in water. 

 The neutral sulphate is a compound of 



Acid 100-00 



Oxide 161-12 



100 parts of the salt take 34-26 of water of crystallization. 



Nitrate of cadmium crystallizes in prisms, or needles, usually 

 grouped in rays. It is deliquescent. Its constituents are : 



Acid 100-00 



Oxide 117-68 



100 parts of the dry salt take 28-31 of water of crystallization. 



The chloride of cadmium crystallizes in small rectangular 

 prisms, perfectly transparent, which effloresce easily when 

 heated, and which are very soluble. It melts before being 

 heated to redness, after losing its water of crystallization, and 

 on cooling assumes the form of a foliated mass, which is transpa- 

 rent, and has a lustre slightly metallic and pearly ; but which 

 speedily loses its transparency in the air, and falls into a white 

 powder. At a higher temperature the chloride of cadmium 

 sublimes in small micaceous plates, which have the same lustre 

 and transparency as the melted chloride, and which undergo the 

 same alteration in the air : 100 parts of fused chloride are 

 composed of 



Cadmium 61-39 



Chlorine. 38-61 



100-00 



Phosphate of cadmium is pulverulent, insoluble in water, and 

 melts, when heated to redness, into a transparent vitreous body. 

 It is composed of 



Acid. 100-00 



Oxide 225-49 



Borate of cadmium obtained by precipitating a solution of 

 neutral sulphate of cadmium by borax is scarcely soluble in 

 water. When dry, it is composed of 



Acid 27-88 



Oxide 72-12 



100-00 



