iS8 



FORESTRY IN NEW ENGLAND 



On the area tallied there was one hemlock 4 inches, one maple 

 8 inches, two spruces 6 inches, two birches 5 inches, three hem- 

 locks 5 inches, four spruces 5 inches, etc. 



After all the trees on a lot have been measured in this way their 

 volumes can be best ascertained by the use of "volume tables," ^ 

 if they are available. Volume tables have now been constructed 

 for many of our important species. They are based on the 

 measurements taken in lumber jobs of several hundred felled 

 trees and give the average volume, either in board feet or some 

 other unit, for trees of different diameters and heights. With 

 such tables the total volume of each species on the lot is obtained 

 separately, a table being constructed similar to the one below. 



In the application of volume tables it will be seen that some 

 give cubic feet instead of fractions of a cord or board feet. The 

 number of cords can be secured by dividing the number of 

 cubic feet by 90 on the principle that a cord of wood (128-stacked 

 cubic feet) contains 70 per cent sohd wood, which amounts vir- 

 tually to 90 cubic feet. Board feet can be converted to cords 

 by allowing 500 board feet as the equivalent of a cord. This 

 varies from 400 feet for small logs to 600 feet for large ones; but 

 it must be remembered that the rule will not always work back- 

 wards, for a cord of wood may be composed of sticks too small 

 to be sawed. 



^ A number of such tables are included in the Appendix. 



