PRACTICE OF TIMBER ESTIMATING 



191 



able size are included, or from 15 to 25 acres if the small trees also 

 are calipered. Small trees are measured principally in studying 

 the question of future growth. 



FORM OF NOTES 



Local ity.. T. 5. R 18,.. W..E..L.S. f Maine. 



Tjpe-Hardu-ood. Slope..... I)ate-Sept..l7^.1901 

 Sheet No. A. 41 



On large tracts satisfactory estimates can be made by the 

 measurement of about 1 out of every 30 acres. In very extensive 

 forest tracts the Bureau of Forestry usually measures not more 

 than one or two out of every hundred acres. 



This method is clearly adapted to securing knowledge 

 of the make-up of a forest, and of its stand of merchant- 

 able timber if good volume tables are at hand to go with 

 it. In the latter connection perhaps the greatest difficulty 

 that arises is in applying the proper heights to the different 

 diameters. This is slight if the tract is of small size and 

 uniform character, but considerable on large tracts with 

 uneven topography and varying stand. In addition con- 

 stant care is required to make sure that the strip is kept 

 of right width, in other words that all trees less than 2 

 rods from the line run are included and none at a greater 

 distance. Careful men do indeed quickly get trained to 



