24 Forest Management 



mails, tanneries, and other industrial establishments requiring large 

 investments to be made close to a forest may, however, seek for sus- 

 tained yields on cut over lands, from which the idling trees have been 

 removed. 



PARAGRAPH XVIII. 



GENERAL REMARKS. 



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

 forest are: 



A. Brick masonry methods. 



1. Area method (Par. XIX.) 



2. Volume method (Par. XX.) 



B. Formula methods. 



3. Charles Heyer method (Par. XXI.) 



4. Hundeshagen method (Par. XXII.) 



C. Increment methods. 



5. Common increment method (Par. XXIII.) 



6. Brandis method (Par. XXIV.) 



7. Pinchot method (Par. XXV.) 



These seven methods consider the forest as a whole, ascertain the 

 productive capacity of the whole, and locate the annual cuttings there- 

 after. 



The methods to be considered in the next chapter (V.), treat every 

 part of the forest according to its individual financial merits, thus locat- 

 ing the cuttings to begin vrith. Thereafter, they merely see to it, if 

 necessary, that the total cuttings of a year agree with the consuming 

 capacity of the market. 



PARAGRAPH XIX. 



AREA METHOD. 



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 rotations 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. The oldest compartments are allotted 

 to period number one; the next oldest period number two, etc. The 

 total acreage allotted to each periodical column is found by addition 

 and compared with the average contents of a column. If a column 

 contains too much acreage, the surplus is shifted backward or forward 

 into adjoining columns. Compartments growing vigorously are shifted 



