Part IV.] Caccia ; Selection method of treatment in India. 385 
Similarly, the percentage of trees belonging to the 45, 50, 55, 60, 
etc., centimeter diameter classes, which have passed into the class 
immediately above, may be calculated ; and results so obtained are 
classified in the following table ; — 
Diameter. 
1 
1 
Percentage paesing into the 
next higher class. 
Arerage per- 
centage. 
Pine. 
Beech. 
Cent. 
% 
% 
% 
40 
• 
7'5 
5-8 
6-6 
45 
7 5 
5-9 
6-7 
50 
8-5 
69 
7'7 
55 
81 
7-7 
7-9 
60 
89 
7-6 
8-2 
65 
9-2 
7-6 
9 2 
70 
9-6 
7-6 
9-6 
75 
9-9 
7-6 
9-9 
80 
10-0 
7-6 
100 
85 
11-6 
7 6 
11-6 
90 
120 
7-6 
12 0 
95 
20-0 
7-6 
200 
To be on the safe side, the mean may be taken at the lowest 
figure above obtained, namely, that corresponding to a diameter of 
40 centimeters. From which it follows that f of the trees with a 
diameter of 40 and over will pass into the next higher diameter 
class during a period of 10 years. In other words, that a period of 
15 years will be required for all the trees of one diameter class to 
pass into the next higher class. 
Therefore, during the 15 years, it would be justifiable to fell the 
following number of exploitable trees, viz. 
23 — 
17 = 6 
trees with a diameter of 45 
17 — 
13 = 4 
ditto 
50 
13 ~ 
9=4 
ditto 
56 
9 — 
7 = 2 
ditto 
60 
7 — 
5-6= 1' 
0 ditto 
65 
6-6- 
4 = 1 
ditto 
70 
h2 
