110 



ELEMENTAEY AGRICULTURE 



tools. The day came when some clever farmer put 

 an iron share on his plow to cut the soil. From that 

 day to this men have gradually improved iron farm 

 tools, and the splendid horse-power machines of all 



Fig. 58. A tractor engine drawing four plows. 



descriptions which do farm work to-day are the 

 result of the wonderful inventions of many bright 

 minds. 



Farm Machinery of To-Day. The poorest farmer 

 of to-day has a plow to turn the sod and stir the 

 soil deeply; he has a cultivator to tear and break 

 the soil, and a harrow to make it fine like ashes 

 for the dust mulch (Fig. 57). Certain soils that 



