DETAILS OF THE METHOD 



89 



will not be represented in the stand. There will be as many 

 ages in the stand as there are cuttings during the rotation. 

 To secure this number divide the rotation by the cutting 

 cycle. (See Figs. 27, 28 and 29.) 



FIG. 29. 



Diagram of a selection forest managed on a rotation of 100 years with a cut- 

 ting cycle of 10 years. The forest contains 10 stands, one of which is cut 

 through each year, thus giving equal annual cuts. Each stand contains 10 

 age classes and together the age classes in the 10 stands form a continuous 

 series of ages from i to 100 years. 



As the interval between cuts is lengthened the amount 

 per acre removed in a single cutting is increased in direct 



