GROWTH OF TREES AND FORESTS l8l 



class of yield tables will be chiefly needed, especially in forest 

 regions with the best market conditions. 



Normal yield tables cannot be made for uneven-aged forests, 

 since cuttings in such forests are made at regular intervals 

 when only a part of the stand is removed. For rough yield 

 tables with which to estimate the growth of such stands, it is 

 customary in this country to designate in tabular form the 

 number of years required for each diameter inch class to grow 

 one inch, and from this to estimate the amount of timber that 

 can be produced in a given period. Since the rate of growth 

 is based almost entirely on conditions different from those which 

 will prevail in the future, these tables should not be taken too 

 seriously. 



