126 THE THEORY AND PRACTICE OF WORKING PLANS 



volume and area should be figured wherever possible in order 

 to have an " area check." * 



The accompanying diagram (Diagram E) shows the rela- 

 tive numerical results of computing the cut by the different 

 methods, using the same data as premises. 



CORRELATION OF SILVICULTURAL METHODS AND METHODS OF 

 DETERMINING THE CUT 



In general it should be borne in mind as Roth points out in 

 his "Forest Regulation," page 159: "Regulation of the cut 

 in amount is very important in development of any forest 

 property to prevent unreasonable 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 silviculture 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 in time.f 



" But in the present beginning stages of forestry, such 

 simple and satisfactory procedure is not possible. More than 

 75 per cent of our large forest areas are not even accessible and 

 assigning an area here to a particular time, can have no mean- 

 ing. For this and other reasons it is necessary to use other 

 methods." 



* " To learn what the condition of the whole forest is with reference to con- 

 tinuity of the determined felling budget, the average age of the entire forest is 



found by dividing the stock bj' the increment I — = a I . This should be equal 



to one-half the rotation; if it turns out to be much less, it may be an indication not 

 to cut the entire increment during the working period, or vice versa, in order to 

 come nearer to normal age." Oberforstrat Frey in " Vereinfachung des Wald- 

 ertragsregelungs-Verfahren," Allgemeine Forst- und Jagd-Zeitung, July, 1905, 

 pp. 232-236. 



t Cotta, a centur>' ago said: " A proper division of area, orderly sequence in 

 cutting, and frequent revisions of the plan, are far more important than a mere 

 calculation of the permissible amount of timber to be cut." 



