ROAD BUILDING AND MAINTENANCE 427 



should be dragged once each way after every heavy rain. 

 This must be done while the soil is moist but not sticky. 



It is not necessary to employ the direct supervision of 

 skilled engineers for the maintenance and repair of earth 

 and gravel roads, providing the rules and suggestions they 

 lay down are carefully and intelligently followed. A dif- 



Tlae split-log drag at work on ail Iowa road. 



ficult piece of construction or fixing of grades should, how- 

 ever, always be carried out under the supervision of an 

 expert. 



TOPICS FOR INVESTIGATION 



1. \Yhat is the prevailing type of road in your local- 

 ity? How many miles of public roads in your school dis- 

 trict? In your county? 



2. What roads do you know which climb steep hills? 

 Can vou devise a method bv which YOU can measure the 



