TECTONA 



767 



(c) Volume figures. Burma. The average volume of marketable timber 

 in trees of different girths and ages in the Mohnyin and Mosit working circles 

 has been estimated by Mr. Blanford as follows : 



Tectona gramlis : outturn of marketable timber from trees of different sizes, 



Mohnyin and Mosit. 



Note,. Ten years have been added to the age in each case, to allow for the time required 

 for a seedling to establish itself. 



The latest Tharrawaddy working plan for the Pegu Yoma forests gives 

 the follo^dng outturn figures for dry and moist forest combined : 



Tectona grandis : outturn figures, Tharrawaddy. 



Girth class. 



6 ft. 6in.-6ft. 11 in. 



7 ft. in .-7 ft. 5 in. 



7 ft. 6in.-7 ft. 11 in. 



8 ft. in.-8 ft. 5 in. 



Volume of 



timber 



per tree. 



cub. ft. 



74 



88 



104 



136 



Girth class. 



8 ft. 6in.-8ft. 11 in. 



9 ft. in.-9 ft. 5 in. 

 9 ft. 6 in.-9 ft. 11 in. 



Volume of 

 timber 

 per tree, 

 cub. ft. 

 147 

 166 

 186 



The size of logs actually brought out from the forests must of necessity 

 depend greatly on faciUties for extracting large timber, apart from the size 

 of the trees felled. The largest average logs brought out so far in any one 

 sub-period under working plans prescriptions are the 639 logs extracted from 

 the Kangyi reserve of the Zigon forest division during the sub-period 1902-3 

 to 1905-6, which averaged 103 cubic ft. The following statement gives the 

 names of forests from which the largest avej-age logs were extracted up to 

 1910, the averages being given by single sub-periods : 



Tectona grandis : volumes of average logs extracted during single sub-periods 



from forests in Burma up to 1910. 



