CADMIUM. 23 



As, Pelouze's determination.) The mean result was that 

 100 Ag = 110.345 KBr; extreme difterence, 0.029. This 

 gives Br = 79.958 for Ag = 107.93, and K = 39.137. The 

 bromate of silver was prepared from potassic bromate and 

 silver salts. For the preparation of Ag see Stas' determi- 

 nation of it. The potassic bromate was prepared by the 

 action of chlorine on a mixture of KBr and KHO. The 

 bromide was prepared by the action of heat on bromate, by 

 treating bromine with KHO, and in other ways. No reagents 

 were probably ever prepared with such care as those em- 

 ployed in this and the accompanying determinations. The 

 weights are all in vacuo. {Stas, Untersuch. ilher Chem. Pio- 

 2)ort., Leipzig, 1867.) 



CADMIUM. 



Regnault, Kopp, and Bunsen have determined the specific 

 heat of cadmium, which corresponds to an atomic weight 

 of 112. Deville and Troost determined the density of cad- 

 mium vapor at above 1000°. It answers to an atomic weight 

 of 114. {Gmelin-Kraut, I. c; L. Meyer, I. c.) 



F. Stromeyer : III4S (0 == 16); 696.767 (0 = 100). 



Stromeyer found that 100 parts of cadmium combine with 

 14.352 parts of oxygen to form the oxide. {Berzelius' Lehr- 

 huch der Chemie, 5th ed., 3, 121 9 ; Schweiggef s Journ., 22, 1818, 

 362.) 



T. Thomson : 112 (0 = 16); 700 (0 = 100). 



Thomson says that he has shown this to be the true value 

 bv analysis of the sulphate in two difi'erent states. [System 

 of Chem., 7th ed., 1, 1831, 555.) 



K. VON Hauer : 112 (0 = 16) ; 700 (0 = 100). 



Determined by nine experiments on the reduction of cad- 

 mium sulphate to sulphide in a current of hydrogen sulphide 

 under pressure. The mean of the experiments gave Cd = 

 55.999 ; extreme difference, 0.16. Von Hauer took S = 16. 

 The sulphate was purified by repeated recrystallizations and 

 by conversion into oxide. It was dried at 200°. The sul- 

 phide was in each case carefully examined for undecomposed 

 sulphate. [Erdmann's Journ.'fllr Prak. Chem., 72, 1857, 346.) 



