No. 2. J EDWARDS MONTREAL WATER SUPPLY. 117 



We have, therefore, on the best authority, the condition of the 

 old water supply and of the river waters in question before the 

 present works were completed. 



My own analyses date from 1870 ; but the first series of results 

 which I now submit were made in 1872, from samples of water 

 which I collected myself during a trip from Niagara, in the 

 month of June of that year. 



The quantity of water at my disposal was too small to deter- 

 mine the oro'anic nitroo;en ; but as a record of the solid contents 

 of the waters of the St. Lawrence it may possess some interest. 



Organic Carbon. Mineral Salts. Total. Hardness, 



by Clark. 



River Niagara, 1.10 6.60 7.70 3.5° 



Lake Ontario, 1.01 6.50 7.51 3.3° 



Toronto Bav, * 2.50 8.50 11.00 4.5° 



St. Lawrence, Long 8ault, 1.20 6.60 7.80 3.3° 



Do eointe Cascades, 1.20 6.60 7.80 3.5° 



Do IS. Shore Aqueduct, 1.20 7.60 8.90 3.5° 



* Containing nitrogen. 



With the exception of the water of Toronto Bay, these waters 

 are all clear and pellucid, and run sufficiently near in mineral 

 contents to justify us in accepting the mean as a fair estimate of 

 the quality of the St. Lawrence water. This gives us an average 

 of about 1 grain per gallon of organic carbon, and 7 grains of 

 mineral matter for St. Lawrence water above Lake St. Louis, in 

 the month of June, 1872. In water taken from near the south 

 shore, in May, 1873, I found : 



Oro:anic Matter 1.1 



Mineral Salts 7.8 



Hardness, 3.5^ 8.9 



In December, 1879, water from the inlet of the Longueuil 

 water works srave me : 



ft" 



Organic Matter 1.5 



'ft 



Mineral Salts 10.0 



Hardness, 6^^ 11.5 



In May, 1879, water from the same point, as supplied from 

 the Longueuil water works, contains : 



Oriianic Matter 2.03 



Mineral Salts 9.72 



Grs. per imperial gallon, 11.75 



Hardness, 6.25*^, Clarke. 

 (At this time the river was pretty full and brimming the wharves at Montreal.) 



