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Tables .">.' :in-i f>5a give the per cout ami amount* of the different 

 grades of lumber sawed with a circular saw with ' i-im-h kerf in logs 

 from different parts of the trunk of trees in fully stocked stands of 1>I>- 

 It.lly pint- i:> years old. Quality I, and 65 yean old b< ) utlitiea II 



and 111. re>p.vti\ely. These measurements were made at a mill in Gates 

 County, X. < '. They show the small per cent of upper grades in top 

 logs and indi-M'.' tin- necessity of forcing the length of clear stem of 

 trees in young stands since, at a given age, with equal diamctt-rs, the 

 longer the stem the greater is the proportion of upper grades. (Plate* 

 III. XIV ajid XVII, also I and VII.) The larger proportion of upper 

 jrrades of lumber in the logs of the older stand is noteworthy as well as 

 :pid increase in the amounts of these grades with diameter. This 

 applies to Tables 56 and 5 



Table fi<> -rives 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. 

 The-,' 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 produce,]. 

 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 tn-o which was being cut in the 60-70 years old stand in Gat** County had a mill 

 volume of 143 board feet, and a corresponding breast-high diameUr of 13.0 inches. The grade yield 

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



This gives an f. o. b. Norfolk value of 118.87 per 1.000 bd. ft., which U within a few ceau of UM 

 figure obtainable from Tables 61 and 64. Since cutting in this stand was only to 8 inches in diameUr 

 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 aa average diameter of 11.8 Inch**. 

 a volume of 106 board feet, and an average value per 1.000 board feet of iu lumber of 116.7). 



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

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

 13.7 inches in diameter breasthigh. 



