130 THE WOODSMAN’S HANDBOOK. 
The following is an example of such a table: 
WHITE PINE. 
Contents of 
Diameter |x | | average tree Total con- | 
breasthigh Number of Height | from volume _ tents (board | 


6, 260 | 
| (inches). | toe (feet). | table (board feet). 
| ! feet). | 
ees | E 
10 10° | *% 30 300 
12 fe rene 69 759 
14 oe ae 120 | 36 
16 4 | 86 18 | 740 | 
is 4 91 772; -. pos 
20 Seg Cae 383° | aie | 
22 2° 0) eit 549 | «1.098 | 
| 
| | 
There are a number of other methods used by foresters when 
very accurate results are desired. These are not given because 
they involve complicated mathematical computations, and are 
beyond the scope of this book. 
FOREST WORKING PLANS. 
A forest working plan, as the term is used by foresters, is a de- 
tailed plan for the conservative management of a specified forest. 
Like the forest plans of lumber companies, it contains an esti- 
mate of merchantable timber and a plan for lumber operations. 
It includes, in addition, a study of the growth and production of 
the forest, and also a plan of management insuring its continuous 
productiveness, and at the same time satisfactory financial returns. 
Forest working plans provide not only for marketing the standing 
timber, but also contain directions for cutting the timber in such 
a way that future crops may be larger and obtained oftener than 
under the common systems of lumbering. The conditions in 
America are such that the information contained in forest working 
plans necessarily varies widely on different forest tracts. In all 
cases, however, they contain the essential idea of the management 
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