4 RECONNOISSANCE OF THE LYON NITRATE PROSPECT. 



by taste in parts of the rock on which no efflorescence is visible. 

 Twenty-eight samples were taken, the effort being to have them 

 representative of the rock itself rather than of the film of surface 

 efflorescence which covers it. These samples have been analyzed 

 by Mr. A. R. Merz, of the Cooperative Laboratory of the Mackay 



3 



4 



6 



FIG. 4. View of nitrate exposure on north side of point, showing erosion of stratum No. 5 (below), 



and No. 3. 



School of Mines, United States Bureau of Soils, and Geological Sur- 

 vey, at Reno, and found to contain the following percentages of 

 potassium nitrate: 



1. From tho exposure on the north side of the point. 



Four specimens from No. 3 of section, 0.67, 0.04, 0.84, and 1.68 per cent. 



Six specimens from No. 4 of section, 0.44, 1.18, 1.30, 1.30, 1.68, and 2.24 per cent. 



Four specimens from No. 5 of section, 0.82, 0.89, 1 .44, and 2.12 per cent. 





