32 



To construct the above table 415 felled trees were measured, 

 the diameter being taken at intervals of eight feet along the stem 

 of the tree. The volume of each tree was then computed and 

 the data were plotted on cross-section paper, curves drawn, and 

 the figures for the table read from these curves. The volume 

 of the stump and of the top of the tree was not included. The 

 stump as a rule was 6 to 12 inches high and the top was the 

 portion of the tree above a point where the diameter outside the 

 bark was less than two inches. Big limbs or branches were in- 

 cluded if the diameter at the small end of an eight-foot section 

 measured two inches or more. 



The volume table can not be safely used to measure the volume 

 of single trees. The more trees measured, the closer the average 

 volume will approach the values given in the table. The diam- 

 eter of the trees refers to the diameter outside the bark, mea- 

 sured at a point 4^ feet above the ground. This is known as 

 the breast-high diameter. 



Volume tables for yate (E. cornuta) and for swamp mahog- 

 any (E. robusta), based on diameter measurements alone, are 

 given in the Appendix. 



To convert the volume of a tree in cubic feet to its equivalent 

 in cords it was assumed that on the average 90 cubic feet of 

 solid wood will equal one cord of 128 cubic feet. The values 

 of Table II were, therefore, divided by 90. The resulting Table 

 III shows the volume of different sized trees expressed in deci- 

 mals of a cord. 



