86 



The BUBoter of trees of each claes, when tlie capital hag heen coBslitutea, is 

 evidently the area covered by the claea (10,890 square feet), divided by the average- 

 area covered by one crown of that class ; and wonld, therefore, be as follows :— 



Class I trees. 



..II 17 „ 



ffi-A-*-* # • f • • • ■ • ^' sf 



,. IV . . . 108 „ 



„ V •• 436 „ 



In the crnrse of 30 years, according to the asstimptioi) made, all the trees in eaob 

 class atlain the next higher class. If, therefore, during this interval we fell the- 

 difFerence in numbers, the capital will remain unaltered. This operation maybfr 

 tabulated as follows :— 



At the end of the thirty-year period the crop on the ground wonld thns be the- 

 normal capital. The place of the young growth in class V at the commencement of 

 the period would be taken fly a new stock of seedling which would occupy oue-fonrth 

 of the area, i.e., the portion not covered by the standards reserved. 



This method is applied in the same way as the selection 

 method. The forest is divided into whatever number of 

 annual or periodic coupes the felling rotation requires, and 

 the number of trees to be felled each year is prescribed. 

 The number of stems to be felled in each size or age-class 

 should be stated. 



When first applying such a method to a forest, the num- 

 ber of stems to be felled would not of course, as in the 

 example given, be the difference between the numbers of 

 trees in the various classes. In such a case, the number of 

 stems to he left on the ground having been determined in 

 the manner explained, reference would be made to the 

 results of the enumeration, and the number of trees to be 

 felled would be deduced therefrom. 



Thns, suppose an enumeration of the block or compartment to be exploited, con- 

 taining 200 acres, gives the following results : — 



