A Graphic Sv/inmary of American Agriculture. 



15 



Fig. 7. — Forests, including semiarid woodland (phion-juniper, chaparral, etc.), origi- 

 nally covered about 900 million acres in the United States. About 350 million acres 

 have been cleared for agriculture, and as many more have been cut-over or devastated. 

 (See Fig. 13.) About 600 million acres were clothed originally with grass, interspersed 

 commonly with various herbaceous plant.s. Some 200 million acres of this grassland 

 have been plowed up and used for crops, or for pasture in rotation with crops, includ- 

 ing about 7 million acres irrigated. Desert vegetation characterized "tOO million acres, 

 of which about 12 million acres have l)een reclaimed by irrigation. Half of the remaining 

 forest and woodland is pastured, practically all of the grassland, and nearly all of the 

 desert. (See Fig. 12.) 



7550°— 22 2 



