io DOMESTIC WATER SUPPLIES FOR THE FARM 



water are sufficient to indicate the imperfect nature of this puri- 

 fication. 



Large cities without other accessible sources will doubtless 

 continue to use river waters, but these waters are now, as a rule, 

 scientifically filtered before distribution. On most farms, how- 

 ever, other and safer sources are available, and stream waters 

 which are known to have received drainage or sewage from any 

 source should not be used for drinking. (See Fig. 3.) In the 

 larger streams the pollution is rarely high, and many of them will 

 afford satisfactory supplies for stock. 



