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Analyßs. 4^9 vitriolic acid by nitrated or muriated barytes, the barofeienite precipitatcd, wafhed, dried, ig- nited, and weighed, will detcrmine the quantity of vitriolic acid in the folution, as barofeienite thus made contains one third of its weight of vitriolic acid, of the fame ftrength as that in, tartar vitriolate. ag. We now recur to the dried depofitc, No. i - ; this fliould be treated with nitrous acid, which will take up the barytic and calcareous earths, if any,and poflibly fome portions of argill and iron, from which the folution fliould bp freed by cauftic volatile alkali, and filtration; thefe are to be feparated from each other, as in No. 34* 39. The filtred liquor now contains nothing but calx and barytes. ... 40. Thefe may be feparated by prccipitation, by the vitriolic acid which will form a rnafs of barofeienite and gypfum ; hot water will gradu- ally take up the gypfum, but leave the baro.e- lenite; the water gives up the gypfum, by eva- poration to drynels; the dry mafs fliould be heatcd to rednefs, weighed, and treated as in No. 10, and the barofeienite as in No. 37. , 41. After thefe feparations nothing but the caix of iron and Alex can remain; the calx of iron fliould be taken up by marine acid, or by aqua regia, and, being filtred, the Alex will remain on the filtre, which, when dried, fliould be heatcd to rednefs, and weighed. The_ martial folution fliould be precipitatcd by caullic volatue alkau, which fliould be treared as in No. 19 and 30. ^ 42. If the fluor or boracic acids be fufpecfed in thefe flones, how the former may be deteded will be fliewn in No. 72, and the latter in No. 81. 43. If the marine acid exifts in them, it will be found in the folution No. 4> ^nd may be prc- bl h 3 cipitated