ILLUSTRATIONS 



The Work of the Plow The Greatest Labor of 



Mankind . . .... Frontispiece 



PAGE 

 At Motor Contests ....... 4 



Sources of Power for Plowing . . . 12 



Testing Tractors 16 



Steam Tractors ....... 42 



Engine Power from Cultivating to Threshing . . 44 

 Details of Steam Tractors . . . ... 46 



Details of Steam Tractors 48 



Tractor Mishaps ....... 50 



Gas Tractors . .... 76 



Details of Gas Tractors . ... 78 



Types of Gas Tractors . 80 



Types of Gas Tractors ... 82 



Engine Gang Plows . . . . . . .170 



Engine Drawn Plows on Prairie Sod . . . .172 



Hand Lift Engine Plows Working in Stubbie . .176 

 Tractor Accomplishes All at Once . . . .184 



Tractor Accomplishes All at Once . . . .186 



The General Utility of Tractors . . .216 



Pioneers in Steam Plowing ..... 222 



Saving Time by Good Management .... 224 



The Various Uses of the Traction Engine . . .298 



