414 Irrigation and Drainage 



villiers has shown that typhoid fever and cholera, when rife in 

 Paris, were completely arrested at the irrigation fields." 



" In the Massachusetts table of comparison of the purified 

 effluent of seven sewage filters and the waters of seven wells 

 used for drinking by many persons, it is shown that there 

 were three and one -half times ar many bacteria in the well 

 waters as in the effluents. /; 



