198 F. H. Storer on Nitric Acid and Chlorate of 
of this disadvantage and of the long time required to 
. wash out the last traces of nitrate of barium I have always, 
found that a sulphur determination made by the nitric acid 
process requires much less time for its completion than one 
made by the old way with chlorhydric acid. 
In a final trial made expressly for the purpose of testing this 
int, the precise times consumed in making each experimen 
quarters were required to complete the determination of sulphur 
in the portion of vermilion treated with chlorhydric acid while 
the estimation of sulphur in the other portion, treated with 
nitric acid was finished in nine hours and a half. 14:32 per 
cent of sulphur was found in the portion treated with nitric 
acid and 1425 per cent in the portion treated with chlorhy- 
dric acid, instead of the 13°79 per cent required by theory. 
February, 1868. : 
Estimation of Chromium as Chromate of Barium; by A. H. 
PEARSON, 
taken to wash the precipitated chromate with acetate of am- 
monium or some other saline solution in which chromate of 
barium is insoluble. 
I. A quantity of anhydrous chromic oxyd was prepared by 
heating bichromate of potassium with an excess of strong chlor- 
* Proceedings of American Academy, 1859, iv, 342. 
