120 MOSQUITO ERADICATION 



There seems to be no doubt that, in localities to which it is 

 suited, machine ditching is considerably cheaper than ditching by 

 hand. 



FlG . 80.— Implement C. (Courtesy of Buckeye Traction Ditcher Company.) 



MAINTENANCE OF OPEN DITCHES 



One of the most objectionable features of the open ditch, from 

 an anti-mosquito viewpoint, is the necessity of maintaining it in 



