~—_, 
86 THE WOODSMAN’S HANDBOOK. 
The total amount of timber on the area on which the trees are 
counted are then determined as follows: Find from a volume 
table, such as that given on page 181, the amount of timber in an 
average two-log tree of each diameter, and multiply this amount 
in each case by the number of trees of the diameter in question. 
Add together the results thus secured for the total amount of tim- 
ber in the two-log trees. Make a similar calculation for the three- 
log trees, or the four-log trees. Then add together the total con- 
tents of the two-log, three-log, and four-log trees for the total amount 
of timber on the area. 
Another method is to estimate the total height of each tree when 
measured and to group the trees in height classes as follows: 
WHITE PINE. 
Diameter | Under 60 | 60to80 | 80to100 100 to 120 | Over 120 
high. feet. feet. feet. feet. feet. 
75 ae 
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The total amount of timber on the area may be determined in 
the way described above, if volume tables exist which give the 
contents of average trees under 60 feet, 60 to 80 feet, 80 to 100 
feet, etc., in height. 
If no such tables exist but there are tables for trees of all heights, 
the cruiser should measure in the woods the average heights of 
trees under 60 feet, 60 to 80 feet, 80 to 100 feet, etc. He should 
then compute the average diameter of the counted trees under 60 
feet, 60 to 80 feet, 80 to 100 feet, etc. Knowing the diameter and 
the height of the average tree under 60 feet, its content is secured 
- from a volume table of heights and diameters. This value is then 
multiplied by the number of trees under 60 feet in height. The 
contents of the trees 60 to 80 feet, 80 to 100 feet, etc., are found in 
the same way, and the totals are added together for the total 
amount of timber on the area. 
