TO 



pected contamination. Therefore, believing that these well could 

 not represent the normal well waters in the state, series of 

 samples were collected from fanns in five widely separated sec- 

 tions, namely, at Elgin, Kankakee, Champaign, Centralia, and 

 Cairo. At Elgin deep rock wells predominate, and are in ex- 

 cellent condition. At Kankakee shallow rock wells predomi- 

 nate, and are in good condition. At Champaign, drift wells i6o 

 feet deep are in the majority, and are in good condition. At 

 Centralia, the shallow, dug wells predominate and are poor. 

 At Cairo, the samples were taken from cisterns, driven wells, 

 and from one artesian well. The wells are in good condition. 



Conclusions drawn from the examinations made, indicate that 

 driven, drilled or bored wells can be obtained in many parts of 

 the state, and are preferable. Where dug wells are necessary, as 

 at Centralia, better precautions must be taken to prevent sur- 

 face contamination. 



