240 Dr. Gorham’s analysis of sulphate of Barytes. 
weight of this precipitate was 75 grains, exclusive of the 2 grains of 
alumina, which, if the analysis of Klaproth be taken as a datum, must 
of course contain 58°50 parts of Barytes. 
Now according to the experiments of the same chemist and of 
Fourcroy, 100 parts of sulphate of Barytes are composed of 66 of the 
earth and 34 of the acid, and consequently the above 58°50 parts 
must have been combined, in the mineral we have attempted to ex- 
amine, with 29°83 parts of sulphuric acid. 
Following the above calculation the proportions of the component 
parts of our native mineral are 
Barytés 2 OSTEO eee 
Sulphuric acid - - - - - - = - « - - 29°83 
Silex = ies bat * = = = - = - - - ~ - A, 
ANS Se” he ee 8 
Water = baal - al = a - - - = - ey po . 
; 97°33 
AMBRE eee wo: ont eee eae < ate Se 
100°00 
The uses to which the sulphate of Barytes may be applied are rath- 
er limited. In chemistry it is employed for the purpose of obtaining 
the pure earth, and for the preparation of its nitrate, muriate and hy- 
dro-sulphuret. It has been said by men of practical information in 
Boston to afford a good base for water colours. 
Boston, August, 1810. 
q 
4 
' 
