370 
Indian Forest Records, 
[VOL. I. 
Approach to accuracy how many of the seedlings wiU arrive at maturity, and, 
if these are not included, the calculation of the number of V Class trees which 
pass into the IV Class is manifestly wrong. 
As has been stated already, the whole area is to be girdled over in 30 years, 
which has been divided into five sub-periods of six years each. The area has 
been correspondingly divided into 5 sub-periodical areas, which have been 
equalised as much as was possible, having regard to proper distribution of trees 
during the sub-periods. The annual yield being 1,800 trees, the yield for each 
sub-period will be 10,800 and for the whole period 54,000. 
As an example of a working plan prepared on the Burma Method 
„ 1 „ 11- • j in which the felling period is taken to be 
Example 2. Felling period = . ° v 
a sub-multiple of the rotation equal to a convenient sub-multiple of the 
(exploitable age). whole rotation, the working plan for the 
East Yoma forests,* Burma, may be quoted. 
The forest is mostly very uniform; there are patches of indaing, porno and 
jungle woods, but their area is unimportant and they are scattered through the 
teak forest. The Satsuwa and Tindaw reserves are in detached blocks, but they 
are small, so the three reserves will be included in one working circle. 
The area has been divided into 51 compartments. The interior boundary 
lines follow natural features, streams, ridges, or spurs, and along these lines, 
except in the case of large streams, trees have been deeply blazed and marked 
with a C hammer. At all the intersecting or salient points hard wood posts 
have been erected bearing zinc numbers indicating the adjoining compartments 
and surrounded by a heap of stones or earth. 
Main watershed ridges have been invariably selected as compartment 
boundaries, and within each drainage smaller watersheds and streams. The 
compartments were numbered by drainages, beginning in the east near the 
sources of each stream. The average size of the compartments in the East 
Yoma main reserve is 1,796 acres, in the Satsuwa and Tindaw reserves they are 
smaller as they contain many plantations, and the reserves are small. 
The whole of the Tindaw reserve, Compartment No. 1, was counted out, 
as it is full of plantations and all the enumerators were available. In each of 
the other 50 compartments at least two sample plots were chosen. 
The number of sample plots in the 50 compartments was 120, and their 
average area 195 acres : while the total area counted out in the whole working 
circle was 25,085 acres, being 29 per cent. Twenty recounts were carried out 
as a check on the work of the enumerators; some of the results were very good 
and most of the others fair. 
In calculating the growing stock for the whole area 1,125 acres in Com- 
partments, 45, 46, 48, and 49 have been subtracted from the area, representing 
precipitous unworkable slopes : 198’6 acres of streams must also be subtracted 
from the area statement : deducting these from 85,345‘8 acres, the productive 
area is 84,022'2 acres. On this area the growing stock is as follows : — 
Sound dead teak above 44 feet in girth . . . 10,485 
Unsound teak above 3 feet in girth .... 18,642 
* Working Plan for the East Yoma, Satsuwa and Tindaw Reserves in the 
Thayetmyo Division, Pegu Circle, Burma, by A. Rodger, I.F.S., 1906. 
