% 
8 
. 
: 
2 
" 
. 
; 
C. H. Wing on certain Double Sulphates. 363 
was slightly washed with cold water. The configuration of the 
crystals could not be well made out, but was apparently one of 
the complex forms of the regular system. 
as formed by adding the roseo-cobalt solution to an ex- 
cess of the cerium solution. The crystals formed were similar 
to X but larger. 
X. 1-0661 grms, substance gave ‘2395 gr.€e, 0, and 2908 €oS6, 
3270 6s oc “ 1° 
6025 BaS@, 
12715 “ & “ -3910H,@ 
XT. 19660 “ 52 “ -4702 €e,0, and -4960 €oSO, 
E3038 © . “ 9-2970 BaSO 
20620 = iz SS G0S7 HO 
These results lead to the formula: 10 NH, €o0, 350,+€e,350, 
+5H,9. 
X. XI. Calculated. 
SO, 4978 4997  — 50°66 
€e 18°18 19°36 16°08 
€o 10°39 9°60 10°39 
NH, 14°96 13°83 14°96 
H,98 7°00 7°31 7°91 
100°26 100°07 * 100°00 
ith cerous sulphate a homogeneous crystallization of the 
precipitate could be obtained only by a the cerium solu- 
tion to a large excess of roseo-cobaltic sulphate. e crys- 
two luteo salts apply also to the roseo salt though with less 
force, insomuch as the appeara 
characteristic. ae 
The analyses show the ceric and cerous salts to contain the 
same number of atoms of water which is in accordance with the 
supposition of isomorphism. oe 
! ave 4700 €e,0, and °4713 _ 
ae jesse Mer tee Laat Base, 
16596“ «“ « -4880 H,@ 
Which seems to indicate the formula: 10NH, €0, 350, + 
3 
(€eSO,)+5H, 0. A Se 
. 47°23 46°90 
€e 20°99 22°31 
€o 9°90 9°6r 
NA, 14:27 13°85 
H,¢? 6°75 7°33 
99°14 100°00 
I did not succeed in forming an analogous salt of lanthanum. 
