[■ from a well at West Maitland near the middle of the town: 



Oxide of iron, alumina and silica 3-40 grs. per gin. 



Sulphate of Calcium 23-98 



Nitrate of Calcium 4-61 



Nitrate of Sodium 15-07 



Nitrite of Sodium 40-59 



Nitrite of Magnesium ... ... 21-79 „ 



Chloride of Sodium 6 43 



Total inorganic salts ... 115-87 



lat referred to above, viz., the ac- 

 and nitrites in the underground 

 water arising from the excretions of a dense population. Although 

 the water of the river is in touch as it were with the underground 

 water, it is found that in the first well-water the calcium and 

 magnesium salts are increased; doubtless from lime in buildings in 

 the neighbourliood, but there not being much population in its 

 neighbourhood the nitrogenous organic matter has rather decreased. 



On the otlier hand all the impurities 



have i 



increased where the 



population is dense, and the nitrogenous constituents enormoi 



isly 



so. Such water whilst quite unsuitable for domestic use wc 



.uld 



suit admirably for irrigation, which 



would 



be following out 



the 



practice of the ryots in some parts of : 



India, ^v 



'ho prefer the wa 



ters 



of their village wells to even a canal 



water for that purpose, 



the 



preference being traced to the nitrates 





rater which increased 



the crops from their manurial value. 









Water from deep well j 



at Gum 



ledah. 





Silica 



2-53 



grs. per gin. 





Oxide "of Iron and Alumina 



•52 







Carbonate of Calcium 



18-22 







Carbonate of Magnesium ... 



2-83 







Sulphate of magnesium ... 



30-OG 







Nitrate of Potassium 



•40 







Nitrate of Sodium 



•98 







Chloride of Sodium 



34-51 







Total inorganic matter 



90-05 







Of these inorganic matters 19-87 g: 



rains w, 



ere deposited on boil- 



ing for two hours. 









