Paet IV.] Caccia : Selection method of treatment in India. 365 
because they are required for seed purposes : but the deficiency can be easily 
made good from the second class, many of which in the drier parts are even 
now 6 feet in girth (23 inches diameter) and consequently fit for felling. Of 
the trees estimated to reach maturity there remain — 
seven-eighths third class ...... 46,970 
all fourth class ....... 77,130 
Total, say . 124,000 
which it is proposed to allot as follows : — 
to third period, five-eighths 3rd class trees 
to fourth period, two-eighths 3rd — 4th class 
to fifth period, three-fifths 4th class 
33,600 
44.200 
46.200 
Total . 124,000 
This allotment is of course only a rough approximation and is only given to 
show that the younger classes are sufficiently well represented. The plantations 
should yield at least 12,000 first class trees, which will go to swell the outturn 
in the later period. 
iv. — The Burma Method. 
The Burma Method is based on the number of trees that annually 
reach the exploitable size during a given period. The size (girth or 
diameter breasthigh) of the exploitable tree and its age (rotation) 
having been determined, the possibility consists in ascertaining the 
number of trees which annually reach that size. This possibility 
may be determined either on the number of trees which may be 
supposed to reach the exploitable size during the whole period of 
the rotalion, or during a shorter period df the rotation only. Again, 
in the latter case, this period may be made equal to the number of 
years that a tree remains in the penultimate* girth class, or merely 
a fraction of the whole rotation. 
All trees above the exploitable size actually existing in the forest 
would naturally constitute surplus stock, and they may be removed 
within any suitable period of time in addition to the real yield, 
calculated as above explained on the annual increment of the forest, 
that is, on the mimber of trees annually attaining the exploitable 
girth. 
* By penultimate girth class is meant the girth class immediately preceding the 
girth class which has been fixed for the minimum exploitable size. 
