THE MERCHANTABLE FOREST. 



17 



The number of trees per acre below 22 inches in diameter is dispro- 

 portionately small, as was shown by figure 1, which is a graphic rep- 

 resentation of this table. The trees now approaching- merchantable 

 size are not sufficient in number to maintain the present proportion of 

 mature timber. This has a serious influence on future yields, since it 

 lengthens considerably the time required for the production of a sec- 

 ond crop equal to the present one, and it shows, moreover, that the 

 land is capable of producing a much larger stand of timber than it is 

 now maturing. 



The following table gives the average contents of standing pine in 

 board feet, by Doyle's Rule, on a basis of diameter at breastheight, 

 and holds good for both Shortleaf and Loblolly Pine. Figure 3 is a 

 graphic representation of this table. 



Table No. 3. — Contents of pine, in board feet, according to diameter breasthigh. 



[By Doyle's Rule.] 



STAND OF MERCHANTABLE PINE. 



The following table shows the average stand per acre in board feet 

 of merchantable pine on the pine lands, cutting to various diameters: 



Table No. 4. — Average stand of merchantable pine />er acre, in board feet, cutting to 

 diameter limits of 12, 14, 16, 18, and 20 inches, breasthigh. 



22019— No. 32—02 2 



