336 REPORT OF THE FOREST, FISH AND GAME COMMISSIONER. 



and, further, the actual growing stock found in the forest. Multiplying 

 the actual growing stock by the above ratio, Hundeshagen obtains his 

 actual possibility of the forest. 



In normal forests (yield table forests), the ratio is necessarily at an 

 optimum. If that optimum is applied to abnormal forests, over-cutting 

 seems ths necessary consequence. Absurd results are apt to crop out if 

 the growing stock is under normal and the increment poor. 



Inasmuch as the method requires periodic stock taking, over-cutting 

 or under-cutting the forest for any length of time is, however, excluded. 

 Indeed, any method is good which controls its own results by periodic 

 stock-taking. Hundeshagen's method is applicable to all sorts of silvi- 

 cultural conditions, and might well be applied in a tentative first working 



plan. In that case, it will be sufficient to express the ratio, " normal 



2 

 increment over normal growing stock " by the fraction — . 



n 



Common Increment ?\efI)ods 



The increment methods are the oldest and roughest methods of yield 

 regulation. The underlying idea is the following: As long as only the 

 increment is cut — no more, no less — an over-cutting of the forest is 

 impossible. The average production per acre can be ascertained from 

 yield tables, by systematic experiments, or, as is the usual practice, by 

 estimating. 



The methods do not pay any attention to normal growing stock, normal 

 age, gradation and normal increment. The methods are not applied any- 

 where, nowadays, in scientifically conducted forestry. 



grandis Aetl)od 



The Brandis method was first applied by Sir Dietrich Brandis in the 

 Teak forest of Burma. The method ascertains the number of mature trees 

 in a forest as well as the time which an equal number of trees styled "imma- 

 ture," next in diameter to the mature class, require to grow as large as the 

 mature trees are, so as to be fit to replace them. 



Dividing the number of mature trees by the period of replacement, 



