20 



fact that gray birch has relatively less merchantable length 

 than all other hardwood species for its total height. For this 

 reason it is an exception to the conclusion that the volume 

 of a tree of given height and diameter in cords and cubic feet 

 is the same, regardless of species. 



APPLICABILITY OF TABLES 



The individual plots from which the better hardwood 

 tables were derived varied greatly in the proportions of the 

 various species in mixture. Since this was found to have 

 little or no effect on the volumes of these plots it is fair to 

 suppose that the tables are applicable to a wide variety of 

 mixtures. The test of the Harvard Red Maple Volume 

 Table, described on page 14, indicates that even-aged 

 second growth hardwoods on similar sites have much the 

 same form regardless of species. Mill tally scales also appear 

 to bear out this belief. If this is true, the present tables 

 should be capable of wide use both in the determination of 

 the present and future yields of individual stands, and in 

 more general computations relating to the stand and growth 

 of hardwoods throughout the region. 



