APPLICATION OF METHODS 159 



In the Selection Forest, diameter limit is used to assure, ap- 

 proximately, the desired rotation. Here the assumption is that the 

 good trees, forming the harvest part of the cut, (in distinction to 

 stuff cut for improvement and thinning) are of a certain size at a 

 particular age, an assumption amply accurate for the purpose in 

 hand. 



III. Application of Methods of Regulation of Cut in the 

 United States. 



Regulation of the Cut in amount (Area or Volume) is very 

 important in development of any Forest property to prevent un- 

 reasonable overcutting which could defer any desired regularity of 

 income for a long time and bring permanent injury to parts of a 

 forest. But it is not as important as is good protection and silvicul- 

 ture and a suitable division of the forest, for these together with 

 any degree of orderly sequence of cutting will in themselves work 

 in the direction of regularity and will in all forest properties largely 

 replace Regulation of the cut and necessity for special measurements 

 and calculation, just as they have done in parts of the old world. In 

 time Regulation must simplify itself in any good forest into the 

 task of going over the property about once in twenty years, and 

 picking out the stands either ripe enough to cut, or stands in bad 

 condition and therefore in need of cutting, and assigning these to 

 the next twenty years' work, area indicated by the rotation adopted. 

 If this is 100 years, then approximately one-fifth of the entire forest 

 should be assigned to a period of twenty years. 



But in the present beginning stages of forestry, such simple and 

 satisfactory procedure is not possible. More than 75% of our large 

 forest areas are not even accessible and assigning an area here to 

 a particular time, can have no meaning. For this and other reasons 

 it is necessary to use other methods, and it is interesting to see how 

 these may apply to particular forms of forest and conditions, as 

 they now exist in the United States. The following suggestions are 

 general. 



i. Regulation in the Woodlot. 



It may seem pedantic to speak of a regulation of the cut in a 

 twenty or forty acre woodlot. But experience in the woodlots of 

 our country shows clearly that not only are such woodlots suffering 



