GIRTH INCREMENT OF HEVEA BRASILIENSIS. 
85 
the period of most active growth, and November- December. 
All measurements are given in centimetres : — 
No. 
of 
Tree. 
Initial 
Girth, 
1912. 
Jan. 
to 
March. 
April 
to 
Oct. 
Nov. 
to 
Dec. 
Initial 
Girth, 
1913. 
Jan. 
to 
March. 
April 
to 
Oct. 
Nov. 
to 
Dec. 
Initial 
Girth, 
1914. 
Jan. 
to 
March. 
1 
19-8 
0 
7*1 
0-8 
27-7 
0-3 

, 


2 
21-6 
0-3 
5-7 
0-5 
28*1 
0*2 
— 
— 
— 
— 
3 
23-8 
0-1 
4*2 
0 
28-1 
0-5 
3*9 
0 
32*5 
0*5 
4 
20-2 
0-3 
5-7 
0-4 
26-6 
0*2 
5*0 
0*4 
32*2 
0*1 
5 
20*2 
0*2 
5-2 
0-8 
26-4 
1*1 
— 
— 
— 
— 
6 
25-0 
0 
5*0 
0-2 
30*2 
0 
3*4 
0*4 
34*0 
0-1 
7 
28-0 
0*1 
7-0 
1*1 
36-2 
0*8 
5*8 
1*1 
43*9 
0*3 
8 
23*5 
0 
7*3 
1-1 
31*9 
1*0 
7*1 
1*3 
41*3 
0*4 
9 
44-3 
0-2 
2-8 
1-1 
48-4 
ro 
2*7 
1*0 
53*1 
0*3 
10 
31*5 
0 
6*1 
1*1 
38-7 
0*4 
— 
— 
— 
— 
11 
32-6 
0-1 
6-0 
1-3 
40-0 
1*0 
— 
— 
— 
— 
12 
350 
0 
8'4 
1*2 
44*6 
0*8 
.7*6 
0*5 
53*5 
0 
13 
36-9 
0*1 
5-0 
0*1 
42*1 
0*1 
5-3 
0 
47*5 
0*3 
14 
31-2 
0-1 
8-5 
1-0 
40*8 
0*5 
6-9 
0*6 
48*8 
0*2 
15 
38-6 
0*4 
6-2 
1*0 
46-2 
0*7 
4*1 
1*0 
52*0 
0*9 
16 
33-2 
0-1 
5*8 
0*3 
39-4 
0*1 
5*5 
0*7 
45*7 
0*4 
* 
The percentage increases for each year are given below : — 
Girth, 
Percentage 
Girth, 
Percentage 
No. of Tree. 
January, 
Increase, 
January, 
Increase, 
1912. 
1912. 
1913. 
1913. 
1 
19*8 
39 
9 
27*7 
— 
2 
21*6 
.. 30 
1 
28*1 
— 
O 
O 
23*8 
.. 18 
1 
28*1 
15*7 
4 
20*2 
. . 31 
7 
26*6 
21*1 
5 
20*2 
.. 30 
7 
26*4 
— 
6 
25*0 
20 
8 
30*2 
12*6 
7 
28*0 
. . 29 
3 
36*2 
21*3 
8 
23*5 
. . 35 
7 
31*9 
29*5 
9 
.. 44*3 
9 
3 
48*4 
9*7 
10 
31*5 
22 
8 
38*7 
— 
11 
32*6 
22 
6 
40*0 
— 
12 
35*0 
. . 27 
4 
44*6 
20*0 
13 
36*9 
14 
1 
42*1 
12*8 
14 
31*2 
30 
8 
40*8 
19*6 
15 
38*6 
. . 19 
7 
46*2 
12*6 
16 
33*2 
18 
7 
39*4 
16-0 
'As previously stated, the first three trees were untapped 
during the whole period, the next five were not tapped during 
the period of most active growth of the first year, while the 
last eight had been tapped for some time previous to 1912. 
There does not appear to be any marked effect in the growth 
of trees Nos. 4 to 8, which can be attributed to the tapping. 
The poor growth of tree No. 9, the initially largest tree, will 
be noted ; this tree bore a heavy crop of seed in both years. 
6(10)16 (12) 
