C. Wolf on the equivalent of Cerium. 55 
decanted and washed with boiling water. The mother-liquor 
still contained a large portion of the rare oxyds, but these were 
very much mixed with other bases. 
he dried oxalates were then placed into a porcelain dish 
and decomposed by heat over an open fire, care being taken to 
of the precipitate. — : i 
This basic sulphate, although sometimes prepared by a dif- 
ferent rocess, has been used by most chemists as a starting 
point for the preparation of pure salts of cerium, and the sul- 
phate obtaing! from it has served for the determination of its 
_ equivalent. ee ae 
_, The washed basic salt, obtained by the method above men- 
tioned, I divided into two equal parts; with the one I repeated 
the experiments made by previous observers, while the 
