and clear was loaded with nitrates produced by the decomposition 

 of nitrogenous organic matter, and it will be observed that whilst 

 the inorganic nitrogen is high the organic is low. This indicates 

 that the conditions as to presence of basic bodies being satisfac- 

 tory the nitrifying ferment had full play. If all the nitrogen had 

 been present as ammonia in one form or other, it would have 

 amounted to the enormous quantity of over one thousand parts 

 per million or more than the average of sewerage. This shews 

 that the nitric nitrogen of waters should be taken into account. 

 This well is not far removed from the old Devonshire Street 

 Cemetery, but there is no visible connection between them as deep 

 drainage intervenes. Tlie water is not used. 



Another water from a well at Bourke Street, Redfern, contained 

 free sulphuric acid as an impurity, the source of which coyld not 

 be accounted for unless there was some underground connection 

 with the old Kerosene Works at Waterloo. The water had an 

 acid reaction and contained 3-7 grains of free sulphuric acid per 

 gallon. Neither nitrates nor nitrites were present. It had been 

 used for boilers and destroyed two valued at £700. 



Water from the Hunter River at West Maitland the sample 

 being taken when the river was low : — ■ 



Sulphate of Calcium 1-.38 grs. per gin. 



Carbonate of Calcium 2-2cS 



Carbonate of Magnesium ... 3-19 „ 



Chloride of Sodium 9 -71 



Potassium salts traces 



Inorganic ammonia per millic 

 Organic ammonia „ 



Nitrates and phosphates minute t 



Water from a well at W^est Maitland i 

 most of the population : — 



16-56 



Oxide of iron with tr 



aces of al 



umi 



ina and silica 1-06 



Carbonate of Calcium 





6-39 



Sulphate of Calcium . 







1-32 



Carbonate of Magnes 



ium '.'.'. 





7-24 



Chloride of Sodium , 







6-78 



Potassium salts and i 



litrates 





trace 



Total i 



norganic 



sal 



ts 22-79 



Inorganic amm 







0-10 parts per mi 



Organic ammor 



lia... 





0-11 



