ILLUSTRATIONS 



Page. 

 Fig. 1. Map of Ohio, showing the location and the numbers of the farms referred 



to in the tables of this bulletin 9 



2. Plan showing the drainage system on farm 10 in Putnam County, Ohio. 40 



3. Diagram showing the acre cost of individual plows, harrows, culti- 



vators, corn planters, and grain drills 51 



4. Diagram showing the annual cost of indi\ddual grain drills, manure 



spreaders, and wagons 52 



212 



6 



