S. P. Sadiler—Analytical Notices, 183 
A larger quantity was then precipitated and washed by decan- 
tation with boiling water, until, according to Bunsen’s tables, 
the impurities remaining were reduced to Tosso0 IM volume, 
"7462 grms. oxalate gave °6950 grms. sulphate 27°39 pr. ct. Ca, 
itd ‘14 “cc *6628 “ “6 
“7127 ==27°35 pr. ct. “ 
"7592 ¢ (o-<908S iit =27°40 pr. ct. “ 
"8208 « “ “+. 1656: ff = 27°43 pr. ct. “ 
The theoretical per cent of Ca in C,0,(Ca)+H,0 is 27-40, 
In some of this last preparation, two determinations of the 
amount of Ca were made by ignition over the blast-lamp and 
weighing as caustic lime. 
1207 grms. oxalate gave 0463 grms. CaO =27-40 pr. ct. Ca. 
1520 « 5S 0RRES SS earls oe oh 
Finally, two portions of perfectly pure calcic carbonate, from 
a crystallized piece of calcite, that had been previously analyzed, 
the composition of which was therefore known, were taken. 
After the precipitation of the lime as oxalate and drying on the 
filter, it was put in a weighed platinum crucible and the filter 
ash then added. The whole was then run down as sulphate 
with slight excess of sulphuric acid, with the aid of the “ ring- 
ourner.” Only one analysis is given, as the other was spoiled 
In filtering the oxalate. 
9723 grms. CaCo, gave 1'3058 grms, sulphate =39°50 re et. Ca, 
39°50 per cent Ca corresponds to 55°30 per cent CaO, Bae 
Fresenius gives as the composition of “air dried CaCO,,’ 
5551 per cent CaO, and in his determination of lime as sulphate, 
im experiment No. 67, obtained 55°81 per cent CaO. 
The results given above, it is seen, are as accurate as are usu- 
ally obtained in parallel determinations as carbonate, and the 
fase and rapidity of manipulation are very much greater. 
There is yet another class of operations, in which I thought 
the “ ring-burner” might be of assistance, viz: the processes 
Involving oxidation with fuming nitric acid, which at present 
are rather tedious. I have notas yet, however, given ita careful 
fnough trial to enable me to decide positively, either for or 
against it. 
filter, was taken, placed in a porcelain crucible, and after pag 
moistened with a few drops of dilute acid, was covered wel 
Am. Jour. 8c1.—Turp Serres, Vou. VII, No. 39.—Manon, 1874. 
12 
