CERIUM. 35 



sulpbate from a sulphuric solution of the cerite oxides, and 

 converting this precipitate into the neutral salt. [Erdmann's 

 Journ.fUr Prak, Chem., 30, 1843, 184.) 



C. Rammelsberg : 1S7.93 (O = 16). 



Hermann states that Rammelsberg experimented on 

 cerium salts free from lanthanium, and got Ce = 574.7, the 

 lower oxide being supposed to contain one atom of oxygen. 

 [I cannot find the original paper.] [JErdmarm's Journ. far 

 Prak. Chem., 30, 1843,^184.) 



C. Marignac : U1.79 (O = 16). 



The result of seven experiments on the titration of cerous 

 sulphate, prepared from basic sulphate, with barium chlo- 

 ride. [Erdmann's Journ.fUr Prak. Chem.., ^8, 1849,40(3; 

 Bibl. Univ. Arch des Sciences, 8, 265.) Marignac subsequently 

 made experiments which showed these results to be too high 

 from the impurity of the barium sulphate precipitate, (see 

 note to Turner's determination of Barium,) and that the 

 number 575 (for O = 100 and cerous oxide Ce 0) was more 

 probable, [xinnal. de Chimie et de Physique, (3,) 38, 1853, 

 148.) 



T. Kjerulf : 174.56. 



Kjerulf obtained, by three organic analyses of cerium 

 oxalate, Ce ^ 727.33 on the protoxide theory, = 100. The 

 salt was prepared by dissolving cerium oxide in oxalic acid. 

 (Liebig's Annal., 87, 1853, 12.) Bunsen points out that this 

 must have been a basic salt. [Ibid, 105, 1858, 50.) 



R. Bunsen and J. Jegel : 138.192 (O = 16). 



The lower oxide was presumed to contain one atom of 

 oxygen. In two experiments cerous sulphate was decom- 

 posed with ammonium oxalate. The sulphuric acid thus 

 liberated was determined with barium sulphate ; the cerium 

 oxalate precipitate was decomposed by heat with the forma- 

 tion of eerie oxide, which was weighed and the additional 

 oxygen, introduced by heating, determined by iodometric 

 titration. The salt was not anhydrous ; the water contents 

 was estimated by difference. The experiments gave respec- 

 tively 57.49 and 57.46 per cent cerous oxide in the anhvdrous 

 salt, or Ce = 576.3 and 575.25 if S = 200. One experiment 

 was made on hydrous cerium oxalate. The cerous oxide 

 was found as before ; the water was determined and the 



