Average Wood Production in United States. 



379 



and fire with no appreciable growth, and, the largest class of all, 

 cut over and burned over lands with some growing trees, but 

 usually not nearly as dense as the virgin forest. 



To arrive at any approximation, then, of the total wood pro- 

 duction of the country some rough classification of the entire 

 forest area is necessary. Hence the following is offered : 



Table XIII. — Classification op Forest Land. 



The total forest area, including woodland, is seen to amount 

 to approximately 545,000,000 acres, of which about 50,000,000 

 acres are scrubby woodland, producing only cord wood. This is 

 confined largely to the Southwest, such as the scrub oak, pirion,. 

 and juniper lands of California, New Mexico, Arizona, Texas,, 

 and other Rocky Mountain States. This estimate of total forest 

 area is based on almost complete returns from county clerks,, 

 usually supporting estimates previously made by the United States 

 Geological Survey for Washington and Oregon, the Forest Ser- 

 vice forest maps of California and New Hampshire, and the more 

 general State estimates of Doctor Fernow. 



The classification into mature timber and cut and burned land 

 probably not restocking are estimates based on reports of Pro- 

 fessor Roth for Michigan and Wisconsin and General Andrews 

 for Minnesota, the Geological Survey revised township estimate 

 for Washington and Oregon by Henry Gannett, together with 

 special reports of state foresters, and more general regional re- 

 ports, such as the "Report of the Secretary of Agriculture on 

 the White Mountains and Southern Appalachian Watersheds, 

 1908 ;" "Southern Appalachian Forests," Ayers and Ashe, Geo- 



