409 



Solphateof Barytes is also found as a gangiie to the 

 lead ore on Perkiomen creek, in Montgomery county 

 Pennsylvania. 



JLapis He pat reus ^ Bituminous Sulphate of Ba^ 

 Ttftes^ IS found in Albemarle county, Virginia. 



Saltpetre exists ready formed in caves of Vir- 

 ginia, and in Kentucky; the quantity is said to be 

 equal to any probable demand of the United States ; 

 and is constantly used by the people of those states 

 for the manufacture of their gunpowder, 



JVative sulphates of magnesia and soda^ having a 

 slight admixture of the muriate of soda or common 

 salt, have been found in a newly discovered chamber 

 cf one of the very large saltpetre caverns in Green- 

 ijriar county, Virginia, near the court house,* 



On the road to Reading, five miles from the 

 town, is a stratum oibrecia^ chiefly calcareous, with 

 quartzose pebbles imbedded in it, of various colours, f 



Sulphate of Alinninc ( Alum ) abounds near Pitts- 

 burg, Pennsylvania, and also in the townships of Bar- 

 rington, Oxford and Jeffery, New Hampshire. 



JYitrate of Potash., and nitrate of lime are found 

 in great abundance near Lexington, Kentucky, and 

 in the Cherokee mountain. South Carolina. 



Brimstone has been discovered in Ontario county, 

 New York. It is deposited from the waters of a 

 -Spring which arises ill the Genessee tract, about 

 twelve miles north-vvest of Geneva. The stream is 



* Med. Repos. Hexade 2d, vol. 3d, 

 t It is probable that this is the stone which Mr. Guillemar mistook * 

 for fluor ; which as yet has not been discovered in the United States, 

 Br. Seybert. 



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