If trees, after having been reopened ten times, still yield much 
latex, it is advisable to continue the tapping a little longer only on 
the lower edge of the incisions instead of working both edges. 
In the years 1903 and 1904, the influence of the temperature 
variations on the quantity of the yield of rubber was gone into 
closer,, 
To that effe; .. the trees taken for tapping from the lot planted 
in the Gardens in 1883 were divided into three groups. 
Each group was tapped at different seasons of the year. 
For 1903, the results were as follows: — 
Group. 
I. 
II. 
III. 
Tapped in the month(s) of 
Jan.-Feb. 
June. 
Sept.-Oct. 
Rainfall 
M.M. 
3 2 4 
197 
379 
No. of rainy days 
. . . 
14 
7 
9 
Surface tapped 
... M 2 
I 2'2 
9-26 
12*4 
Total yield ... 
... Grs. 
7,115 
4 , 3 l8 
10,482 
Yield per M 2 surface 
. .. Grs. 
1 
583 
466 
845 
In 1904, these three groups, tapped during other periods, gave 
the following: — 
Group. 
I. 
II. 
III. 
Tapped in the month(s) of . 
Sept.-Oct. 
June-July. 
February. 
Rainfall 
... M.M. 
7 11 
403 
250 
No. of rainy days 
, . • 
17 
13 
9 
Surface tapped 
... M 2 
12-2 
9-26 
I2‘4 
Total yield 
. .. Grs. 
6,718 
4,678 
10,697 
Yield per M 2 surface , 
. .. Grs. 
1 
551 
505 
863 
Inasmuch as both years may be considered wet ones, yet as 
regards that, no marked difference is shown in the yield of the 
rubber. 
The largest variation of rainy days appears in Group II. In this 
group, the yield was a little more in the wet year. 
In wet years, it does not matter when the Hevea trees are tapped. 
In normal cases, the best times for tapping generally are at the 
beginning and the end of the wet seasons. 
Tapping during the rainy seasons is accompanied by practical 
difficulties, as the work is difficult shortly after the rain. 
The collection of the latex is difficult as the trunks from the 
Heveas are still wet from the rain water, as from the flowing 
incisions the latex spreads in all directions of the trunk. 
