510 SMITHSOXIAX MISCELLANEOUS COLLECTIONS VOL. 54 



acid and water were collected alter the usual method. Ten determina- 

 tions were made ; in all of them the above-named prodiicts were estimated, 

 and in five analyses the resulting eerie oxide was also weighed. By de- 

 ducting the water found from the weight of the air-dried oxalate, the 

 weight of llic anhydrous oxalate is obtained, and the percentages of its 

 constituents iwv easily determined. In weighing, the articles weighed 

 were always counter|)()ised with similar materials. The following weights 

 were found : 



Oxalate. Water. CO.. CeO.. 



9.8541 2.1897 3.6942 



9.5368 2.1269 3.5752 



9.2956 2.0735 3.4845 



10.0495 2.2364 3.7704 



10.8249 2.4145 4.0586 



9.3679 2.0907 3.5118 4.6150 



9.7646 2.1769 3.6616 4.8133 



9.9026 2.2073 3.7139 4.8824 



9.9376 2.2170 3.7251 4.8971 



9.5324 2.1267 3.5735 4.6974 



These figures give us the following percentages for COo and CeOo in the 

 anhydrous oxalate : 



COj. CeO^. 



48.256 



48.249 



48.248 



48.257 



48.257 



48.258 63.417 

 48.257 63.436 

 48.262 63.446 



48.249 63.429 

 48.253 63.430 



Mean, 48.2546, ± .001 Mean, 63.4316, ± .0032 



Hence Ce = 141.5G. Hence Ce = 141.48. 



These results could not be appreciably affected by combination with 

 the single oxalate experiments of Jegel and of Eammelsberg, and the 

 latter may therefore be ignored. 



Robinson's work, published in 1884,' was based upon pure cerium 

 chloride, prepared by heating dry cerium oxalate in a stream of dry, 

 gaseous hydrochloric acid. This compound was titrated with standard 

 solutions of pure silver, prepared according to Stas, and these were 



» Chemical News, 50, 251. 18S4. Proo. Hoy. Soc, 37, 150. 



