118 



ECONOMICAL MINERALOGY. 



prosecuted here as elsewhere ; and with it and common salt, several subsidiary arts might be 

 established. When we consider the favourable location of the district in which the Onondaga 

 springs are situated, and the facilities of communication which it possesses with the north and 

 west, we cannot doubt that all these advantages will, at no distant period, be fully improved. 



For the purpose of determining the relative purity of various kinds of salt, I have subjected 

 them to analysis, and the results are expressed in the following table,, in which I have also 

 introduced the analyses of several foreign specimens by Dr. William Henry. 



TABLE 



Showing the composition of various specimens of Onondaga and foreign salt, in 1000 parts. 



No. I. 

 11. 



III. 



IV. 



V. 



VI. 



VII. 



VIII. 



IX. 



X. 



Salt made by solar evaporation at Syracuse. 



Salt made by solar evaporation at Geddes, by Mr. Brew- 

 ster. 



Table salt prepared by A. Woodruff, Salina. 



Salt labelled 'extra good,* made I'y Buel & Foot, Salina. 



Salt made by boiling saturated brine at the works of Dr. 

 Green, Salina. 



Salt made by slow evaporation. Syracuse, Mr. Byington. 



Salt made by boiling, at Salina. 



Salt condemned, at Salina. 



Salt ditto ditto. 



Turks Island salt. 



No. XI. Liverpool fine salt. 



XII. Bay salt, St. Ubes. 



Xm. Ditto, St. Martins. 



XIV. Ditto, Oleron. 



XV. Salt from sea water, Scotch (common.) 



XVI. Ditto, Scotch (sunday.) 



XVII. Ditto, Lymington (common.) 



XVIII. Ditto, Lymington (cat.) 



XIX. Cheshire salt, crushed rock. 



XX. Ditto, . fishery. 



XXI. Ditto, common. 



XXII. Ditto, stored. 



* The specimens from No. I. to XI. inclusive, were analyzed by myself; the remaining ones were analyzed by the late Dr. 

 Henry of .Manchester. ( Reperti nj of Arts, Vol. XVII. Second Series.) — All the specimens which I examined, were brought, 

 previously to the analysis, to a state of perfect dryness, by a heat of from 4000 to 500o F. The loss in weight was from one half 

 to twelve per cent. In Nos. Vfll. and IX., the proportion of water was very large. It was probably the imperfect manner in 

 which the drying process was performed, rather than the amount of saline impurities which they contained, that subjected them to 

 the condemnation of the inspector f And sulphate of magnesia. 



