IgQ GEOLOGICAL RECONNOISSANCE 



matter to the solvent action of water; this extract contained 1.33 parts of 

 anhydrous nitric acid, corresponding to 2.493 parts of nitre. 



The air-dried earth lost 7.59 per cent, of moisture at 212 deg. F. 



No. 42. Nitre-determination, in a nitre earth, labeled " red nitre earth 

 above and below the laminated nitre earth, same cave." 



The watery extract from 100 parts of air-dried earth contains 3.305 

 parts of anhydrous nitric acid, corresponding to 6.195 parts of nitre. 



According to Dr. Owen, the air-dried earth lost 3.15 per cent, of mois- 

 ture at 300 deg. F. 



This nitre-earth is by far the richest of the three, a ton yielding nearly 

 124 lbs of nitre. 



WELL AND RIVER WATER. 



The examinations of these waters having been performed in the field, 

 with comparatively limited means, only qualitative analyses could be 

 made, and in these even, regard could only be paid to such constituents 

 as occur in not inconsiderable quantities. I hope to be enabled to report 

 at a future period full quantitative analyses of the water of the principal 

 rivers and mineral springs. 



No. 43. Water of the St. Francis river, taken at Chalk Bluffs, Greene 

 countv. 



The ordinary reagents showed only the presence of 

 Bi-carbonate of lime, and 

 Bi-carbonate of magnesia. 



No. 44. Water from a well on A. L. Stuart's farm, Greene county. 

 This water is remarkably pure, containing no lime, and only a small 

 quantity of 



Bi-carbonate of magnesia, and a trace of 



Chloride of magnesium, or an alkaline chloride. 



No. 45. Water from a well on Wm. Lane's farm, Greene county. 

 This is also a very pure water, containing only minute quantities of 



Bi-carbonate of lime, and 



Bi-carbonate of magnesia. 



