C. H. Wing on certain Double Sulphates. 361 
A highly acid solution of pure ceroso-ceric sulphate was then 
heated and precipitated by a hot saturated acid solution of 
Iuteo-cobaltic sulphate. A bright yellow highly crystalline 
precipitate was formed, which was slightly washed with cold 
water, and which did not adhere to the filter on drying. 
- This precipitate when viewed under the microscope appeared 
as cleanly crystallized hexagonal prisms, of uniform size, and 
Without admixture of other forms. Three preparations were, 
in this manner, madé, which resembled one another in color and 
general character and which were separately analyze 
VV. -1°0345 grms, substance gave ‘2160 €e, 0, and ‘2935 050, 
* 0 Md “ ee 1°287 4 
17650 “« 5670 H,G 
VL 10075 «“ “ “« +9150 €e,0, “ 2840 €oSO, 
11665 “ i “ 1-4680 Ba SO, 
11645 “ i “« -3690 H,90 
VIL. 1-1330 « a“ « +9455 6e,0, “ +3108 OvSO, 
FOOIT «“ “ 1/2695 Ba 
13358 a“ “« -4148 HO 
These results lead to the simple formula 
12 NH, €0,350,+€e, 350,+H,0 
This compound is of interest as being a purely ceric salt. It 
endures a temperature of 150°C. without decomposition. 
Vv VIL VIL. Calculated. 
$9, 51°80 51°83 52°2 52:42 
€e 16°90 1727 17°54 16°63 
€o 10°80 10°74 10°44 10°74 
NH, 18°66 18°56 18°05 18°57 
H,@ 2°47 2°21 2°39 1°64 
100°63 10061 100°64 100°00 
wing to all appearances the same crystalline form. I regret 
much that I ave, as yet, been unable to obtain crystals of such 
ensions as wo al 
morphism by actual measurement. I can at present only say, 
that the two substances cannot be distinguished from one another 
under the microscope. 
VIII. 1-0240 grms, substance gave °3050 ce, 6, and -2505€050, 
“8500 “ “a oe "9858 Base 
9588 “ «“ « 9650 H,0 
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