112 
Dr. Henry’s Analysis of several Varieties 
have any action. The weight of the insoluble portion was 
then ascertained. 
(C. a.) By this operation were dissolved, not only the mu- 
riate of soda, but all the other salts, insoluble in alcohol, which 
might be mingled with it. To the solution, carbonate of soda 
was added ; and the liquid, which in most cases gave, on this 
addition, an abundant precipitate, was boiled briskly for seve- 
ral minutes, in order that none of the earthy carbonates, 
which were separated, might remain dissolved by an excess 
of carbonic acid. 
( C. b. ) The precipitated earths were allowed to subside, 
and were well edulcorated with boiling water, the washing 
being added to the liquor first decanted from the precipitate. 
To these united liquids, (after the addition of more muriatic 
acid than was required for saturation) muriate of barytes was 
added, till it ceased to occasion any further precipitate. The 
sulphate of barytes was then washed sufficiently ; dried ; ig- 
nited ; and its amount ascertained. 
To the earthy carbonates, an excess of sulphuric acid was 
added in a platina dish, and the mixture was triturated, till all 
effervescence ceased. It was then evaporated to dryness, 
calcined in a low red heat, and the weight of the earthy sul- 
phates was ascertained. 
(D. a.) The dry sulphates were washed with a small 
quantity of lukewarm water. In several instances, the loss of 
weight, thus sustained, was extremely trifling, nothing being 
dissolved but a very minute portion of sulphate of lime, of 
which earthy salt, solely, the residue was presumed to be 
composed. 
(D. b.) But in other cases, a considerable loss of weight 
