C. Wolf on the equivalent of Cerium. 57 
The anhydrous salt was then dissolved in a large quantity 
of water, the solution heated and precipitated by a concen- 
trated boiling solution of oxalic acid. The filtrate should 
always be tested by ammonia and should not give a precipitate, 
if the proportions of oxalic acid are correct. 
The greatest precautions are necessary in the ignition of the 
oxalate, because the resulting ceroso-ceric oxyd is in such an 
exceedingly finely divided condition that the slightest shaking 
will occasion a loss, unless the crucible be covered by a well 
fitting lid. 
The resulting ceroso-ceric oxyd was always analyzed and the 
amount of cerous oxyd corresponding with it determined ac- 
cording to Bunsen’s volumetric method by iodid of potassium 
and chlorhydric acid from the amount of liberated iodine. 
1—1'4542 prs. of B, gave 0°19419 grs. water and ke St, 
ceroso-ceric oxyd, * corresponding | wit. 
oxyd ; 0°70325 grs. of ceroso-ceric oxyd gave 086766 & ns 
of cerous oxyd. 
2.—1'4104 grs. of C, gave 0°1898 grs. water and 0°7377 grs. of 
ceroso-ceric oxyd, giving 0°70217 grs. of cerous oxyd. 
3.—1°35027 ers, of C, Se 0:1820 on water and 0° seks a 
of Si ceotarie ox dc rresponding with 0°67261 grs 
: oxyd; 0°6916 grs. ears oxyd gave 0°65829 ors, aves 
oxyd. 
According to these results the anhydrous sulphate contains 
as follows : 
Bs C, 0; 
Cerous oxyd, 57-494 51526 B75 14 57531 
Sulphuric acid, 42°506 A4Q°474 42°426 42°469. 
100°000 100°000 100°000 1007000 
B, would give for the equivalent of cerium 46°104 
© c é< ‘ 46°176 
ic 2 3 é a3 46°281 
giving as the mean result=46-187. 
The anhydrous sulphate consists according to these numbers _ 2 : a 
of one equivalent of base for one of acid. 
or of the crystals is as follows : 
€, C, Mean. 
Cerous oxyd, i9 816 49785  49°813  49°805 
Sulphuric acid, 36°830  36°758  36°708 36-765 
ater, 13-354 13457  18°479  13°430 
100°000 100°000 100°000 ene : 
‘These resu with the calculated analy , which res 
Ponds to ie formula: 3(CeO, SO,)+5HO. : 7 
