LOBLOLLY OR NORTH CAROLINA PINE. 



Ill 



Tables 55 and 55a. give tlie per cent and amounts of the different 

 grades of lumber sawed with a circular saw with i^-inch kerf in logs 

 from different parts of the trunk of trees in fully stocked stands of lob- 

 lolly pine 45 years old, Quality I, and 65 years old between Qualities II 

 and III, respectively. These measurements were made at a mill in Gates 

 County, ]Sr. C. They show the small per cent of upper grades in top 

 logs and indicate the necessity of forcing the length of clear stem of 

 trees in young stands since, at a given age, with equal diameters, the 

 longer the stem the greater is the proportion of upper grades. (Plates 

 III, XIY and XYII, also I and YII.) The larger proportion of upper 

 grades of lumber in the logs of the older stand is noteworthy as Avell as 

 the rapid increase in the amounts of these grades with diameter. This 

 also applies to Tables 56 and 57. 



Table 56 gives the per cent of different grades of lumber in trees of 

 different diameters in fully stocked stands 40 to 50 years old on dif- 

 ferent quality sites, and Table 57, the same for stands 60 to 70 years old. 

 These tables show the per cent of grades which trees in stands on dif- 

 ferent quality sites can be expected to yield at 45 and 65 years.* By 

 interpolation the proportion can be ascertained for trees in stands of 

 intermediate ages, and the proportion can be approximated for trees in 

 younger and older stands. Few commercial stands will be produced, 

 however, beyond the age of 60 years. This table used in connection 

 with value table (Table 58) enables the probable future value of a stand 



*The average tree which was being cut in the 60-70 years old stand in Gates County had a mill 

 volume of 142 board feet, and a corresponding breast-high diameter of 13.6 inches. The grade yield 

 of such a tree (between quality classes II and III) is obtained from Table 57 as consisting of: 



This-gives an f. o. b. Norfolk value of $18.87 per 1,000 bd. ft., which is within a few cents of the 

 figure obtainable from Tables 63 and 64. Since cutting in this stand was only to 8 inches in diameter 

 breasthigh, the average diameter is .6 inch larger than that obtained from Table 16. 



The 45 year old stand, Quality I, also in Gates County, has an average diameter of 12.8 inches, 

 a volume of 106 board feet, and an average value per 1,000 board feet of its lumber of $16.72. 



The average of these figures, $17.80, corresponds very closely to the Norfolk price that the output 

 of this operation brought when cut in the winter of 1912. The average tree cut in this operation was 

 13.7 inches in diameter breasthigh. 



