Tectona.] .CKX. 



This gives us the cubic contents at ditlerent. ages as follows : 



280 



The annual increment increases steadily to the age of 30 years, and probably continues 

 increasing for a considerable time beyond it. 



^'uiiiber of trees and cubic contents of growing stock per acre. Regarding the 

 number of trees and the growing stock per acre at different ages, we depend almost 

 entirely upon Nilainbur for our data. Sample areas of half an acre each were selected 

 in each of seven plantations ; each tree was measured, the cubic contents determined, 

 and the following is the result. It is not expressly stated, but it is probable, that 

 these sample areas were all selected on alluvial soil* : 



Colonel Beddome estimates that on alluvial soil, the Teak at Mlanibur will reach 

 maturity at from 60 to 80 years ; that fellings will be spread in each plantation over 

 50 years ; and that at the time of cutting (say at 85 years of age) the mean quarter 

 girth will be 2 feet, the length of bole will be 70 feet, and the mean cubic contents 

 of each tree 280 cubic feet. He also estimates that at that age, there will only be 60 

 trees to the acre, making the cubic contents per acre 16,800 cubic feet. 



No safe speculations can be formed regarding the future of a pure Teak forest 

 like that of Mlarnbur. In its natural state Teak does not grow alone, but is associated 

 with bamboos and a variety of other trees ; and it is impossible to foresee the risk 

 of damage by storms, insects, disease, or other causes to which pure Teak forests may 

 be exposed. It may be doubted whether, even on the best alluvial soil, the average 

 mean girth of trees 85 years of age will be as much as 8 feet. On the other hand, 

 it is_not impossible that the bole will be longer than 70 feet, and it is probable that 

 it will be advantageous to allow more than 60 trees per acre. On page 155 of the 

 Attaran Report of 1860, a plot in the Tsintsway forests (Yoonzaleen) is described 

 measuring 3,833 square feet, and stocked with 8 Teak trees with clear steins to the 



* The length of stem to the top of sale measurement, where the head begins, of every tree in tho 

 mtationa of ISM to IsK both inelnsive, was measured by sending up a climber with a tape. In tho 

 plantations of 1853 and 1S63 a large number of felled saplings were available, of which the average 

 wus tiikcii. 



The mean imarter girth was determined in the following manner. Ten sapling were measured 

 Direai Ugd, and in the middle of tho stem at half its length, and this ^ive ; as the reduein" factor 

 i nose trees 30 inches in girth breast hi^h were fouud to have a girth of 23 inches in tho middle of tho 



2 x 



