the financial interest of the farmer. Annual income 

 from woodland is best for most farmers, and it can be 

 had by carefully planned annual cutting. Some 

 farmers prefer to work their timber at longer intervals. 

 The quantity of wood harvested cannot exceed 

 growth if the woodland is to remain fully productive, 

 so cutting must be regulated to take no more than 

 growth. This can be done by following two simple 

 rules : 



1. Remove excess tree growing stock by thinning tlie woodland 

 to "D+6'' spacing once in about 5 years. 



2. In addition to removing trees under the spacing rule, and 

 after this operation is completed, harvest the largest trees at the 

 rate of one per acre per year. 



Application of rule 2 tends to assure a perpetual 

 harvest of sawlog-sized trees; under this rule wood 

 volume is removed, on an average, only as fast as it is 

 added by growth. If a higher rate of cutting is prac- 

 ticed, tKe growth of the forest cannot keep pace with 

 cutting, and as time goes on the trees available for cut- 

 ting will be too small for sawlogs. If too few trees are 

 cut the largest ones may become overmature, and this 

 may result not only in loss of growth but also in loss of 

 volume, due to defects. 



For annual income, it may be advisable to divide the 

 woodland permanently into five parts and cut over one 

 part each year according to rules, taking five of the 

 largest trees per acre. An owner who prefers to re- 

 ceive income from his woodland once every 5 years 

 should definitely plan to cut over the whole of it at 5- 

 year intervals, taking five crop trees per acre. If it 

 becomes necessary to cut at irregular intervals, the 

 average number of crop trees taken per acre should equal 

 the number of years since the last cut. 



When trees of merchantable size die or are harvested 

 for special purposes, or are deadened, between the regu- 

 lar cutting years, they should be counted in the crop- 

 tree quota. 



