14 ROYAL SOCIETY OF CANADA 



analyses show *' that the Eiver Ottawa annually delivers to the St. 

 I;a%vrenee and the sea, per volume, only 20 per cent of the amount of 

 calcium now annually delivered to the sea by the average river of the 

 globe/' 



The accompanying sketch map kindly furnished by M;r. C. Coutlée, 

 CE., gives the course of the\ river between the cities of Ottawa and 

 Montreal. From Ottawa to Gren ville village, opposite Hawkesbury, is 

 the 60 mile stretch of water navigated from Ottawa. From Grenville 

 to Greece Point is 12 miles of rapid water with a fall of 50 feet. From 

 Greece Point to Carillon there is a level, lield up by the Carillon dam, 

 twenty feet high, over which the river pours into the Lake of Two 

 Mountains. At Ste. Anne's at the western end of the island of Montreal, 

 there is a small fall of 4 or 5 feet. We are indebted to Mr. C. 

 Coutlée, of the Georgian Bay Ship Canal Commission for the sketch 

 of the daily discharge of the Ottawa Eiver at Besserer's Grove for the 

 years 1898-1906, inclusive, which gives by months the daily discharge 

 of water, the straight line indicating the average for the year. To obtain 

 the flow of water passing out of the Lake of Two Mountains, by months, 

 it is necessary to add to the figures of the diagram as follows: 



During May, 30,000 cubic feet per second. 



During June, 20,000 cubic feet per second. 



And rest of the year 10,000 cubic feet per second. 



Twenty-five per cent of this amount passes Ste. Anne's; the re- 

 mainder flows by Vaudreuil, Back Eiver and St. Eustache. 



The population living in the cities and villages on the river bank 

 between Ottawa and Ste. Anne's is about 150,000, and only the following 

 places have sewers which discharge into the river : — 



Ottawa — population 80,000 



Hull " 15,000 



Hawkesbury " 4,750 



The remaining villages — Thurso (600), Papineauville (1200), 

 Montebello (800), Calumet (400), Grenville (500), Carillon (300), 

 and Ste. Anne's (1,200) on the north bank, and Eockland (3,000), 

 L'Orignal (4,500), Point Fortune (400), Como (300) and Vaudreuil 

 (600) on the south bank, have no sewers. The other villages shown on 

 the map are situated back from the river's edge for half a mile or further. 



The earlier analyses of the river water taken at Ste. Anne's, showed 

 that B. coli was constantly present in small quantities of water, and 

 hence it was important to find out if this contamination was due to 

 infection from the sewage of Ottawa, Hull and Hawkesbury, or owing 

 to surface drainage and pollution. 



