324 Bowen’s Analysis. 
Arr. XIV.—Analysis of the Sulphat of Strontian from 
‘Lake Erie, and of some Sulphats of Barytes ; by Mr. 
Grorer T. Bowen, of Providence, R. I. 
Remarks by the Editor. 
In our present No. pa. 279, we have inserted notices of the 
sulphat of strontian from Lake Erie. The highly respecta- 
ble authority upon which those localities have been receiv- 
~ ed, scarcely demands any confirmation, especially. asthe 
external characters support the opinion of the gentlemen who 
have given their names to the public. Still the actual analy- 
sis is always desirable, and especially in this country, where 
we have so few original analyses of our own native minerals. 
Those detailed in the annexed paper were executed by a 
pupil in the Labratory of Yale College. The research 1s ex+ 
cluswely his own ;—we will observe, only, that the reagents 
were all pure, and that the results of all the stages of the 
analysis being shewn us, at the moment, were considered 
entirely satisfactory. 
The discovery of sulphat of strontian in our sulphats of 
barytes, must be deemed interesting’: Klaproth madea sim- 
ilar observation on some of the sulphats of barytes which he 
examined ; but in no instance did he find so much as Mr. 
Bowen found in’ the: Betlin mineral ; he generally found 
from one to two per cent, but the Berlin mineral. affords 
nearly four per cent. The analysis of the Erie strontian 
was performed upon afragment of the very. on and pure 
crystal furnished by Major Delafield. — 
Analysis of the Sulphat of Strontian. 
A. 
Three pieces whose specific gravities were respectively 
3.82, 3.78, and 3.88, were finely pulverized and sifted. 
B. 
Two hundred grains of this powder were mixed with 
three times their weight of pure carbonat of potash and six 
ounces of distilled water, and the mixture boiled for two 
hours—the loss of water by evaporation being from time to 
time supplied, 
