36 



THE COMMERCIAL HICKORIES. 



Table 9, based on 630 trees, shows, according to diameters, the 

 general average total height and merchantable length. In cases 

 where diameters alone are known, the table may be used with caution 

 to supply the missing merchantable lengths. 



TABLE 9. Relation between height and merchantable length of hickories of various 



diameters. 



Table 10, based on 600 trees, shows the proportion of heartwood, 

 sapwood, and bark in the merchantable portions of trees of .different 

 diameters. It may be used in connection with Table 8 to show how 

 much must be allowed for bark and what proportion of the cut is 

 sapwood. 



TABLE 10. Proportion of heartwood, sapwood, and baric in hickories of different diameters. 



Table 11 shows the proportion of heartwood, sapwood, and bark 

 in the merchantable portions of the stem for pignut, shagbark, and 

 bitternut in the Ohio Valley. This table shows the striking contrast 

 between the proportion of sapwood produced by pignut and by the 

 other two species. 



