BRANDTS' METHOD. 825 



necessary to measure the growing stock, and to determine the 

 rotation. 



The method is very simple, and it is specially suited for 

 determining the yield of selection forests. 



4. Ijranctis' Method. 



The method to he described under this Jiead will be better 

 understood by indicating the circumstances which lead to its 

 elaboration. 



Doctor (now Sir Dietrich) Brandis, on being appointed 

 Superintendent of the Pegu forests in Burma in 1856, 

 found himself confronted by enormous areas of teak forests 

 in danger of being heavily overworked. These forests con- 

 tained teak in varying proportions, but on the whole to a 

 limited extent, which has since been ascertained to amount to 

 perhaps 10 per cent., while about 90 per cent, of the growing 

 stock consisted of species, which at that time had no market 

 value. Indeed, the latter were allowed to be removed free of 

 charge without let or hindrance. Moreover, even teak trees 

 required to be of a certain size to make their extraction really 

 remunerative. At that time it was considered desirable that 

 no teak tree should be removed, unless it had reached a 

 circumference of 6 feet, or roughly a diameter of 2 feet, 

 measured at 6 feet from the ground. Trees of that girth and 

 above were called trees of the first class. 



Under these circumstances, Brandis' object was to ascertain, 

 as quickly as possible, the number of first-class teak trees 

 which might be removed annually, without at any rate ex- 

 posing the forests to deterioration. For this purpose he 

 designed a method, by which he ascertained 



(1) the number of first class trees in the forests ; 



(2) the time which it takes to replace them. 



By dividing the number of first class trees ascertained 

 under (1) by the number of years ascertained under (2), he 

 ascertained the maximum number of trees which it was per- 

 missible to cut annually. 



