140 FOREST REGULATION 



If continued this plan will effectively prevent overcut and undercut, 

 and always furnish material twenty years old or of desired age. 

 size and quality. 



b. In Selection Forest. 



Assume: Forest of one Township (about 22000 acres). 



Method : Selection. 



Rotation: About 150 years, judged by diameter of trees. 



Period of Return: Twenty years. 



Growing Stock : 5000 cubic feet per acre by actual cruise. 



Level country, can log any part desired. 



Regulation of Cut here divides the forest into twenty equal 

 parts as in the case of Coppice, and plans to cut over about noo 

 acres or about twenty-eight forties per year. 



Since only part of the timber is cut at each return, the question 

 at every cut is : how much, or what proportion of the stand should 

 be taken? Generally this is left to the forester, whose good sense 

 and^knowledge of silviculture are relied upon. But in many cases 

 this is unsafe and it becomes necessary to decide either on the 

 quantity or volume to remove, or the proportion of the total stand 

 which may be cut. In wild woods the matter is complicated by the 

 great irregularity which exists, and also by the large amount of old. 

 defective, crippled, undesirable material on the ground. Here it is 

 often necessary to combine regular Clear Cutting, or Clear Cut 

 with seed trees in the regular Selection Method, and much freedom 

 must be of necessity allowed to the forester. The first going over 

 generally takes over-ripe, ripe, and defective, it is a cut of ripe tim- 

 ber combined with an improvement cutting just as far as market and 

 good silviculture allow and demand. 



These conditions become better with each return, provided the 

 overcut, which is almost sure to occur in many Cxases, does not hurt 

 the forest to a point where reproduction is effectively prevented or 

 seriously retarded. 



In planning the first cut the stand to be left on the ground is 

 the principal consideration, for the irregularity of the woods prac- 

 tically prevents more than a general figure of volume per acre or of 

 proportion to leave and take. After several returns, a more, definite 

 regulation or volume check can be applied. 



