124 



A. Pedler — On tlie past and present 



[No. 2, 



■will be to decrease the total solids, and to increase the amounts of organic 

 impurity and of nitrates, and that afterwards all the constituents will 

 decrease in quantity. 



That such is the case may be seen by the following analyses made on 

 June 1st, 23rd and 26th and July 1st of last year. Each of the analyses 

 shows the gradual dilution of the water by the heavy falls of rain in the 

 districts from which our supply is collected, and the increase of organic 

 matter and of nitrates due to the washing out of the substances from the 

 soil by the first showers of rain. 



HOOGHLT WATER. 



Hesults of Analysis expressed in parts per 100,000. 



mplo. 



tion of 



purity. 



d 



igen. 





fitrates 



3. 







Haudxess. 



Number of Sa 



Date of coiled 

 Sample. 



Total solid Im 



Organic Carbc 



Organic Nitre 



Ammonia. 



Nitrogen as In 

 and Nitrites 



Total Combia 

 trogen. 



Chlorine. 



Temporary. 



Permanent. 



Total. 



1 



2 



Junelst,1879, 

 June 23r(i, ,, 



19-56 

 17-08 



0-130 

 0-148 



0-052 

 O-099 



•000 

 -001 



Traces 

 only. 

 •023 



O-052 

 0123 



1-32 

 0-923 



4-24 

 3-46 



2- 45 



3- 25 



6-79 

 6-71 



3 



June 26tli, „ 



16-68 



0-138 



0-075 



•002 



•053 



0-130 



0-852 



3-33 



3-38 



6-71 



4 



July 1st, „ 



12-48 



0-113 



093 



•000 



•039 



0-133 



0-89 



0-72 



4-57 



5-29 



Extension of the Present Water Supply. 



As pointed out previously it is now proposed to double the supply of 

 filtered water for Calcutta, and recently a proposal has been urged on the 

 Corporation to collect the new supply of water at Cossipore or Dukhinsahar 

 instead of as at present at Pultah. As I was consulted on this subject and 

 gave a strong recommendation that the water should not be taken from any 

 place near to Calcutta, but that the present source at Pultah should still be 

 used, I may perhaps be allowed to give the substance of my arguments against 

 the two proposed sources of supply at Cossipore and at Dukhinsahar. 



Mj' opinions on this point are to a great extent founded on some 

 previous analyses of the river water taken at various points near to Calcutta, 

 which were made by Dr. Macnamara and Mr. Waldie, when the Calcutta 

 supply was first being introduced, but in addition I have myself made a few 

 analyses which have confirmed me in my conclusions. 



