28 



BULLETIN 933, U. S. DEPARTMENT OF AGRICULTURE. 



undergrowth of young elm, hackberry, and Crataegus, but not of 



walnut. 



Table 9. 



Diameter 

 breast high. 



Number of trees 

 per acre. 



Yield 

 per acre 

 of wal- 

 nut. 



Walnut. 



Other 

 species. 1 



Inches. 

 Below 8. . . 

 8 to 10 

 10 to 12.... 

 12tol4.... 

 14 to 16.... 

 16 to 18 

 18 to 20.... 

 20 to 22.... 

 22 to 24.... 

 24 to 26 



4 

 6 

 12 

 4 

 2 

 8 

 8 

 

 1 



2 



Board 

 feet. 





2 

 4 

 2 







80 

 560 

 880 



2 





230 





26 to 28 







28 to 30 







30 to 32 





2 



Total.. 





45 



14 



1,750 



1 Shagbark hickory, Kentucky coileetree, and white oak, in order of abundance. The two trees 30 to 

 32 inches in diameter were white oak. 



Of the trees over 8 inches in diameter, breast high, the stand con- 

 tains, on an average, 23 merchantable walnut trees to the acre, 38 

 unmerchantable walnuts, and 8 other trees (hackberry, burr oak, 

 and Kentucky coffeetree). The merchantable trees average 2.45 logs 

 to the tree, or 24.5 feet of merchantable length. The average log- 

 contains 55 board feet. Each tree, therefore, averages 135 board feet, 

 and the merchantable stand to the acre is 3,275 board feet. These 

 figures are based on 208 logs that had been cut and were actually 

 scaled. This stand was too small to show maximum productivity, 

 but it indicates what may actually be secured in 60 years in western 

 river-bottom lands. 



MEASURING LOGS AND ESTIMATING STANDING TIMBER. 



MEASURING LOGS. 



The Doyle rule (Table 10) is in general use for scaling walnut logs, 

 and has been used in this bulletin in all computations involving board 

 feet. This rule penalizes small logs very heavily, and does not at all 

 represent the amount that can actually be sawed from them. With 

 the present run of logs averaging 70 to 80 feet to the log, 1,000 feet 

 scaled in the log by the Doyle rule will cut about 1,400 feet of lumber. 

 In logs about 25 inches in diameter the Doyle scale represents closely 

 the actual amount that ran be cut in walnut of good quality. 



ESTIMATING STANDING TIMBER. 



Because of the high value, scattered occurrence, and variation in 

 form, of black-walnut trees, estimates of their volume are now made, 

 not by the " cruising " methods commonly practiced in the timber 



