360 O. H. Wing on certain Double Sulphates. 
The precipitates, being found to contain So Geb oa were con- 
verted into sulphate, oxydized by boiling wit peroxyd of lead 
and again precipitated by luteo-cobaltic sulphate. This last pre- 
cipitate was also found to contain traces of didymium. 
eighed quantities of crude ceroso-ceric oxyd were con- 
verted into sulphate, luteo-cobaltic sulphate and potassic perman- 
ganate added, and the yellow precipitates collected on weighed 
filters and, after weighing, converted into ceroso-ceric oxyd. 
I. ‘5638 grms. substance gave 20395 grms. of yellow salt, yield- 
ing ‘4780 grms. ceroso-ceric oxyd. 
IL. *6960 grms. substance gave 2°3670 germs. of yellow salt, yield- 
i d 
ing 5940 grms. ceroso-ceric oxyd. 
The filtrates were free from cerium. 
In original substance. In yellow salt. 
: I. ; . 
Per cent of €e,0, 84°78 85°35 23°44 25°09 
It appears from this, that the yellow salt, formed in this man- 
ner, cannot be relied upon, as possessing a uniform constitution. 
\ quantity of pure ceroso-ceric sulphate was precipitated by 
adding a slightly acid solution of luteo-cobaltic sulphate; the 
recipitate was washed with hot water. The washings were 
slightly colored to the end, indicating partial decomposition of 
of the salt. The precipitate on drying adhered to the filter and 
was of a rather pale yellow color. 
III. 2°1175 grms substance gave 5640 €e,0, and 4405 €oSO, 
12725 « « “ 1-4035 Bas, 
Ratio. 
so, 45°43 9466 
€e 21 55 4717 
€o 7°92 2685 
This analysis leads to no rational formula. 
A new preparation of this salt was made from a somewhat 
acid solution of pure ceroso-ceric sulphate and washed with hot 
water containing acetic acid. The precipitate was of a deeper 
— than the preceding and did not adhere so strongly to the 
ter. 
IV. 1:8615 grms. substance gave 4060 €e,@, and 5050 €oS5O, 
Ratio. 
€e. 17°65 -- 3862 
€o 10°33 3501 : 
___ Another preparation made from nearly neutral rhino! 
_ sulphate was of much paler color, and adhered more strongl 
the filter, than any previously made: this was not analyzed. Hs 
3 The above pi led to the belief that the salt was contam! 
re 
= i 
ig a ee Se 
