FOREST MANAGEMENT. 333 



For America, at the present moment, these methods will find application 

 in rare cases only. A sustained yield in virgin forests containing large 

 numbers of idling trees is an economic absurdity. Pulp mills, tanneries, 

 and other industrial establishments requiring large investments to be made 

 close to a forest ma}-, however, seek for sustained yields on cut over lands, 

 from which the idling trees have been removed. 



General Remarks 



The methods commonly used for regulating the " possibility " of the 

 forest are: 



A. Brick masonry methods. 



i. Area method. 



2. Volume method. 



B. Formula methods. 



3. Charles Heyer method. 



4. Hundeshagen method. 



C. Increment methods. 



5. Common increment method. 



6. Brand is method. 



These six methods consider the forest as a whole, ascertain the pro- 

 ductive capacity of the whole, and locate the annual cuttings thereafter. 



The methods to be considered in the following pages treat every part 

 of the forest according to its individual financial merits, thus locating the 

 cuttings to begin with. Thereafter, they merely see to it, if necessary, 

 that the total cuttings of a year agree with the consuming capacity of the 

 market. 



Area Aetfyod 



The simplest way to regulate the yield by area is a division of the 

 entire forest area into as many lots as the rotation numbers years. This 

 scheme has been followed often in the case of coppice forests having rota- 

 tions less than forty years. In the case of high forests, the rotation is 

 divided into a number of periods of equal length (ten to twenty-four years). 

 On the " Statement of Ages " the acreage of each compartment is allotted 

 to that periodical column to which it belongs according to its present age. 



