44 BULLETIN 272, TJ. S. DEPAETMEISTT OF AGEICULTUEE. 



Table 12. — Diameter of virgin cypress in Louisiana, based on age. 1 







Diameter 







Diameter 



Age. 



Diameter 

 breast high. 



outside 



bark 20 feet 



from 



ground. 



Age. 



Diameter 

 breast high. 



outside 



bark 20 feet 



from 



ground. 



Years. 



Inches. 



Inches. 



Years. 



Inches. 



Inches. 



10 



0.8 





110 



12.8 



7.3 



20 

 30 



2.3 

 3.7 





120 

 130 



13.7 

 14.6 



8.0 



8.7 



0.6 



40 



5.0 



1.5 



140 



15.5 



9.4 



50 



6.2 



2.4 



150 



16.3 



10.0 



60 



7.5 



3.2 



160 



17.1 



10.6 



70 



8.6 



4.1 



170 



17.8 



11.2 



80 



9.7 



4.9 



180 



18.6 



11.8 



90 



10.8 



5.7 



190 



19.3 



12.3 



100 



11.8 



6.5 



200 



20.0 



12.8 



1 Based on decade measurements on 68 stumps, 92 to 791 years old (average, 263 years). 



There is good evidence based upon the measurement of a large 

 number of trees that diameter growth of cypress under similar local 

 situations over its northern range, for example Missouri and Mary- 

 land, is practically the same as throughout the Southern States. In 

 strongly acid and shallow soil, where growth is exceedingly slow, 

 trees from 8 to 10 inches at breastheight may be from 180 to 240 years 

 old. 



GROWTH IN VOLUME. 



The combined growth in height and diameter determines the growth 

 of a tree in volume. Commercially it is very desirable that the 

 volume increment be made by trees as cylindrical in form and free 

 of branches as possible. 



Large cypress trees, measuring from 5 to 8 feet in diameter, often 

 contain from 5,000 to 10,000 board feet of merchantable lumber. A 

 4-log tree in the Okefmokee Swamp scaled 6,875 board feet, 1 a 5-log 

 tree scaled 12,025 feet, and 3 logs from one tree cut 9,900 feet mill 

 scale. A 5-log tree on the St. Johns River in Florida cut out 9,600 

 feet. There is record on the Santee River, South Carolina, of one 

 22-foot log scaling 4,000 board feet. In stands running from 12 to 

 16 inches in diameter, as many as 10 to 15 logs are required for a 

 thousand board feet. The log run probably averages now mostly 

 between 3 and 5 logs per thousand, 2 although the size of the cypress 

 logged in the same region varies greatly. In 12 consecutive days 

 in 1913 one large company in southern Louisiana, which is clean- 

 cutting a typical deep cypress swamp, hauled out 2,742,000 feet, 

 averaging a little less than 5 logs per thousand feet, or about 208 

 feet per log. 



Tables 16 and 17, given in discussing the value of the timber crop, 

 show the relation between increase in diameter and volume. Volume 



1 Doyle scale. 



2 In 1897 in a typical logging operation, Roth found an average of 10,000 logs to rim about 300 feet, or 3J 

 logs to the thousand board feet. 



