THE THEORY AND PRACTICE OF WORKING PLANS 



113 



1. Administrative necessity. 



2. Disease and decadence (overmaturity) . 



3. Maturity. 



4. Inferiority, slow growth. 



The sum of stands ready to cut for reasons i to 4 gives in 

 area and volume the cut for the next period, subject to the fol- 

 lowing regulating factors: 



(a) The yearly cutting area or volume. 



(b) The distribution of the age classes. 



(c) The results of pre^^ous cuttings. 



(a) Can be determined by any of the methods already 

 described, by area if the distribution of the age classes is not 

 too abnormal (e.g., method No. i), by volume, preferably, 

 if the distribution of the age [classes is far from normal and 

 there is a preponderance of overmature timber (e.g., method 

 No. 9). 



. Judeich expressly states that his method is not restricted to 

 a financial rotation, but is equally well adapted to rotations on 

 other bases. 



(b) Example. — Assuming a general stand table such as 

 that given in Chapter I, Section 2, from this it appears that 

 the following stands * are in need of cutting during the next 

 ten years: 



Reason. 



Compt. 

 No. 



1 . Administrative necessity 



2. Disease and decadence. . 



3. Maturity 



Total . 



9 

 10 



Sub- 

 compt 

 Letter. 



Area 

 Acres. 



61 



100 

 100 



311 



Stand 

 Species and M. ft. b.m. 



Fir 100 

 Fir 75 

 Fir 60 



Fir 235 



= 2675 ^^- ^eet. 



* The selection forest n compartments 3, 5, and 7 is necessarily omitted, 

 since it obviously requires a different method of computing the cut. 



