252 
As so much variation in the yield of latex exists with groups of 
trees it is necessary for the purpose of establishing an advantage 
by any method or period of tapping that the advantage is permanent. 
Table 5, furnishes the result of 6 groups of trees amounting to 86o 
trees tapped daily and alternate daily occasions during 4 years, i,e, 
1904, 1905, 1906, and 1909. From this result Table 5 has been com- 
piled and shews an advantage of nearly 4 % on alternate days over 
daily tappings for four years. 
TABLE 5. 
Advantage of Tapping on alternate days over tapping daily. 
Tapped Daily. 
Tapped alternate Days. 
No. of 
Experi- 
ment. 
No. of 
Trees 
Tapped. 
No. of 
Times 
Tapped. 
Dry weight 
of Rubber 
ozs. 
No. of 
Trees 
Tapped. 
No. of 
Times 
Tapped. 
Dry weight of 
Rubber ozs. 
I 
50 
105 
217 
15 
II 
120 
43 
129 
12 
120 
67 
308 
3H 
III 
60 
20 
25 
2% 
140 
63 
264 
3V 2 
IV 
200 
103 
673 
9 H 
120 
18 
99 
7 H 
V 
200 
80 
453 
m 
200 
15 
195 
8 H 
VI 
150 
78 
680 
7Vz 
150 
51 
187 
9Vi 
780 
429 
2180 
7H 
730 
214 
1055 
oV 2 
Therefore: — 
730 „ 
Plus 50 
780 „ 
780 „ 
daily 
lbs. 
214 times 
= 1055.8 
429 » 
= 2116 
429 » 
= 145 
429 » 
= 2261 
429 » 
= 2180 
/TsT 
or approximately an advantage of 4 % in favour of tapping on alternate 
days over tapping daily. 
