A Graphic Nummary of ATnerican Agricultwre. 



17 



Fig. 9. — Improved land incluiles " all land regularly tilled or mowed ; land in pasture 

 that has been cleared or tilled ; land lying fallow ; land in gardens, orchards, vineyards, 

 and nurseries ; and land occupied by buildings, yards, and barnyards." Ft)ur-fifths of the 

 improved land is in the humid eastern half of the United States," and three-fifths is con- 

 centrated in a triangular-shaped area, the points of which are located in western 

 Pennsylvania, central Texas, and north-central North Dakota. In this area (JO per cent 

 of the land area is improved farm land, whereas in the United States outside this area 

 only 15 per cent is improved. 



