29 



also on hygienic grounds some method should be provided for pre- 

 cipitating, or otherwise separating from our river water the large amount 

 of organic matter it contains before supplying it to the citizens for 

 household use. 



Returning now to the consideration of well A-ater, it will appear 

 that the chief differences in character to be expected between deep 

 well waters on the one hand, and shallow well, or surface waters on 

 the other hand are such as may result from the influence of filtration 

 through deep layers of soil. The most effective way of presenting 

 these differences will be by asking your attention to the following table 

 in which a few shallow wells, and a few deep wells are contrasted as 

 regards the re'=ults of their chemical analysis : — 



No. I — A well in the suburbs of Hamilton, Ont. 



No. 2 — A well at A.shburnham, Ont. 



No. 3 — A well in a bog at Joe's Point, .St. Andrews, N.B. 



No. 4--A well at Brandon, N.W.T. 



No. 5 ~A public well in Winnipeg, Man. 



No. 6 — An artesian well at Goderich, Ont. 



No. 7 — A well at Three Rivers, Que. 



No. 8 — A well in a large tenement house, Sherbrooke, Que, 



. fV' 



