468 DESCRIPTIVE GEOLOGY. 



which, theoretically combined, give: 



Sulphate of lime 75.85 7493 



Sulphate of magnesia 149 2.01 



Chloride of sodium 16.10 17.71 



Chloride of magnesium 3.16 3.00 



Excess - - . NaO,0.84MgO,0.63 



9744 98.28 



A quantity of the soil was taken at the same locality from a depth of 

 2 feet below the surface, which presented the same appearance and texture 



as the former, but yielded, after digestion with water for a considerable 



length of time, 4.83 per cent, of soluble salts of the following composition: 



Lime 3.84 3.76 



Magnesia ' 0.57 0.63 



Soda 34.56 3488 



Potassa trace trace 



Sulphuric acid 7.37 7.21 



Chlorine .-. 52.53 52.37 



Oxygen equiv. SO3 0.14 0.12 



99.01 98.97 

 of which the theoretical composition would be: 



Chloride of sodium. - 86.61 86.33 



Sulphate of lime 9.32 9.11 



Sulphate of magnesia 1.71 1.90 



Sulphate, of soda 1.31 3 .05 



Excess of sodium 0.06 0.58 



99.01 98.97 



