o<! MONTHLY. !> 
XXII. 
COLOMBO, MARCH 2nd, 1903. 
No. 9. 
REPORT ON HEVBA BRASILIENSIS 
IN THE BIALAT PENINSULA. 
Br Stanley Aeden, 
Superintendent, Experimental Plantations, Federated 
Malay States, 1902. 
(Continued from page 515.) 
BE A of trunl to ho tapped — The 
latex is present in all parts of 
the tree, but it is evident from 
the mere observation that when 
tapping the greatest yield is 
obtained from the base of the 
trunk, and experiments have 
been carried out with a viev? to 
determining the difference in yield at various heights 
of the trunk. 
Table 1 shews the result of tapping five trees with V- 
shaped incisions, commencing at a height of 6 feet and 
working by stages of 6 inches towards the base. There 
were three incisions made on each tree at the same 
level and equi-distant apart. 
Table I. 
Av. per 
incision 
ft. 
in. 
oz. 
oz. 
15 incisions at 5 
0 from base gave I'oO dry rubber ■! 
15 do 
5 
6 
do 
1'50 
do -1 
15 do 
5 
0 
do 
1-75 
do '116 
15 do 
4 
6 
do 
2-50 
do 166 
51 do 
4 
0 
do 
4-75 
do -316 
15 do 
3 
6 
do 
4-50 
do '3 
15 do 
3 
0 
do 
5 25 
do 'oo 
15 do 
2 
6 
do 
6-50 
do -433 
15 do 
2 
0 
do 
7-00 
do -466 
15 do 
I 
6 
do 
9 25 
do 'Cie 
15 do 
1 
0 
do 
1V25 
do -75 
15 do 
6 
do 
11-25 
do '75 
It seemed probable, 
however, that 
the '' wound 
effect " mi 
ght account to some extent for the increased 
yield obtftined from the lower 
part of 
the trunk ; so 
bis espevim ent v^as repeated on the samo trees, this 
time commencing at the base and working upwards to 
a he'ght of 6 feet. The result was :— 
Table II. 
Av. per 
incision 
ft. in, oz. oz. 
15 incision at 6 from base gave 12'50 dry rubber "833 
15 do 1 0 
15 do 1 6 
15 do 2 0 
15 do 2 6 
15 do 3 0 
15 do 3 6 
15 do 4 0 
15 do 4 6 
15 do 5 0 
15 do 5 6 
15 do 6 0 
do 10-50 do -7 
do 9-50 do 'ess 
do 7 50 do -5 
do 5-50 do -366 
do 4-75 do -366 
do 4-25 do -283 
do 3-75 do -25 
do 4-GO do •2G6 
do 3 75 do '25 
do 3-00 do -2 
do 2-75 do -183 
It will be noticed that in this experiment the yield 
between 4 and 6 feet was nearly doubled ; v\hile the 
yield from the lower 4 feet of the trunk is about the 
same as was obtained in the previous experiment. 
Taking the results of the two experiments together 
and stating the yield for three sections of the trunk, 
we have : — 
Av. per 
incision 
oz. oz. 
120 incisions base to 2 ft. up gave 78 75 of dry rubber -65 
120 do 2 to 4 ,, do 39'25- do -32 
120 do 4 to 6 „ do 20-75 do -17 
This experiment shevss very clearly what part of the 
trunk contains the largest amount of latex and demon- 
strates the necessity of confining the attention as much 
as possible to the first four feet from the base. 
Other experiments with similar objects in view 
were conducted on trees tapped on the herring-bone 
system ; the result of tapping five trees, 3 to 6 feet up 
the trunk, being shewn in Table III. 
In each case the oblique incisions, were 1 foot long 
and 1 foot apart, there being si's snch incisions, three 
on each side of the vertical channel, which was 3 feet 
long, the wounds being renewed on 14 consecutive 
days. 
